Vectors u = 6(cos 60°i + sin60°j), v = 4(cos 315°i + sin315°j), and w = −12(cos 330°i + sin330°j) are given. Use exact values when evaluating sine and cosine.
Part A: Convert the vectors to component form and find −7(u • v). Show every step of your work. (4 points)
Part B: Convert the vectors to component form and use the dot product to determine if u and w are parallel, orthogonal, or neither. Justify your answer. (6 points)
Answers
PART A: component form of the vector is:
u = <3, 3√3>
v = <2√2, -2√2>
w = <-6√3, 6>
-7(u • v) = 42(√6 - √2)
PART B: u and w are orthogonal
How to write vectors in component form?The component form of a vector is <x, y>.
PART A:
u = 6(cos 60°i + sin60°j)
x = 6(cos 60) = 6 * 1/2 = 3
y = 6(sin 60) = 6 * (√3)/2 = 3√3
In component form, u = <3, 3√3>
v = 4(cos 315°i + sin315°j)
x = 4(cos 315°) = 4 * (√2)/2 = 2√2
y = 4(sin 315°) = 4 * (-√2)/2 = -2√2
v = <2√2, -2√2>
w = −12(cos 330°i + sin330°j)
x = -12(cos 330°) = -12 * (-1/2) = -6√3
y = -12(sin 330°) = -12 * (√3)/2 = 6
w = <-6√3, 6>
The dot product of two vectors is given by:
A•B = A[tex]_{x}[/tex]B[tex]_{x}[/tex] + A[tex]_{y}[/tex]B[tex]_{y}[/tex]
−7(u • v) = -7 * [(3 * 2√2) + (3√3 * -2√2)]
= -7 * [6√2 - 6√6]
= 42(√6 - √2)
Part B:
The vectors will be parallel if the dot product is equal to the product of the magnitudes which means the angle between the vectors is 0 or 180.
The vectors will be orthogonal if the dot product = 0. This means the angle between them = 90.
The dot product of the vectors (u) and (w) will be as follows:
u = <3, 3√3>
w = <-6√3, 6>
u • w = (3 * -6√3) + (3√3 * 6)
= -18√3 + 18√3
= 0
Since the result of the dot product = 0. The vectors (u) and (w) are orthogonal.
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Related Questions
A random sample of 258 observations has a mean of 35, a median of 32, and a mode of 35. The population standard deviation is known and is equal to 5.8. The 99% confidence interval for the population mean is: "Answer is: {LowerLimit} to {UpperLimit}"
Group of answer choices
A. 30.5 to 38.1
B. 34.1 to 35.9
C. 24.2 to 25.8
D. 24.3 to 25.7
Answers
The 99% confidence interval for the population mean is (33.49, 36.51), so the answer is A. 30.5 to 38.1.
We can use the formula for the confidence interval for the population mean when the population standard deviation is known:
CI = X ± z*(σ/√n)
where X is the sample mean, σ is the population standard deviation, n is the sample size, and z is the z-score corresponding to the desired confidence level.
First, let's calculate the z-score for a 99% confidence level. From a standard normal distribution table, we find that the z-score for a 99% confidence level is approximately 2.576.
Next, we can plug in the given values and solve for the confidence interval:
CI = 35 ± 2.576*(5.8/√258)
CI = 35 ± 1.51
CI = (33.49, 36.51)
Therefore, the 99% confidence interval for the population mean is (33.49, 36.51), so the answer is A. 30.5 to 38.1.
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find the dimensions of the following linear spaces. (a) the space of all diagonal 5 \times 5 matrices (b) p 7 (c) the space of all lower triangular 4 \times 4 matrices
Answers
The dimension of the space of all diagonal 5x5 matrices is 5. This is because there are 5 diagonal entries in a 5x5 matrix, and each of these entries can be any scalar, making the space spanned by 5 basis vectors.
You didn't provide enough information for part (b) "p 7". Please clarify the question for that part. The dimension of the space of all lower triangular 4x4 matrices is 10. In a lower triangular matrix, all entries above the diagonal are zero. For a 4x4 matrix, there are 4+3+2+1=10 non-zero entries, which can be any scalar, making the space spanned by 10 basis vectors.
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A coin is biased so that the probability a head comes up when it is flipped is 0.6. What is the expected number of:heads that come up when the coin is flipped 10 times? tails that come up when the coin is flipped 10 times?
Answers
We would expect to see 4 tails on average if we flip the coin 10 times.
When a coin is flipped, there are two possible outcomes: heads or tails. Each outcome has a probability associated with it, which in this case is 0.6 for heads and 0.4 for tails.
To find the expected number of heads that come up when the coin is flipped 10 times, we can use the formula:
Expected number of heads = Probability of heads x Number of flips
So in this case, we have:
Expected number of heads = 0.6 x 10 = 6
Therefore, we would expect to see 6 heads on average if we flip the coin 10 times.
Similarly, to find the expected number of tails that come up when the coin is flipped 10 times, we can use the same formula:
Expected number of tails = Probability of tails x Number of flips
In this case, the probability of tails is 0.4, so we have:
Expected number of tails = 0.4 x 10 = 4
Therefore, we would expect to see 4 tails on average if we flip the coin 10 times.
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A box with fifteen integrated circuit chips contains five defectives. If a random sample of three chips is drawn, what is the probability that all three are defective?
Answers
The probability that all three chips drawn are defective is 2.2%.
To find the probability that all three chips are defective, we can use the formula for the probability of independent events.
First, we need to find the probability of drawing one defective chip from the box. Since there are five defective chips out of fifteen total chips, the probability of drawing a defective chip on the first try is 5/15.
Next, we need to find the probability of drawing another defective chip on the second try. Since we are drawing without replacement, there are now only 14 chips left in the box, including four defectives. So the probability of drawing a defective chip on the second try is 4/14.
Finally, we need to find the probability of drawing a third defective chip. Again, since we are drawing without replacement, there are now only 13 chips left in the box, including three defectives. So the probability of drawing a defective chip on the third try is 3/13.
To find the probability of all three events occurring, we can multiply the probabilities together:
(5/15) x (4/14) x (3/13) = 0.022
So the probability that all three chips drawn are defective is 0.022, or approximately 2.2%.
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Consider the following initial value problem: y" – 7y - 18y = sin(5t) y(0) = -2, 7(0) = 7 = = Using Y for the Laplace transform of y(t), i.e., Y = L{y(t)}; find the equation you get by taking the La
Answers
The equation obtained by taking the Laplace transform of the given initial value problem is:
Y = [5 / ([tex]s^2[/tex] + 25) - 2s - 7] / (s^2 - 25)
To solve the given initial value problem using Laplace transform, we first take the Laplace transform of both sides of the differential equation:
L[y"] - 7L[y] - 18L[y] = L[sin(5t)]
Using the properties of Laplace transform, we have:
[tex]s^2[/tex] Y - s y(0) - y'(0) - 7Y - 18Y = 5 / (s^2 + 25)
Substituting the initial conditions y(0) = -2 and y'(0) = 7, we get:
s^2 Y + 2s + 7 - 7Y - 18Y = 5 / (s^2 + 25)
Simplifying this equation, we get:
s^2 Y - 25Y = 5 / (s^2 + 25) - 2s - 7
Now we can solve for Y:
Y = [5 / (s^2 + 25) - 2s - 7] / (s^2 - 25)
We can use partial fraction decomposition to simplify the expression further:
Y = [A s + B] / (s + 5) + [C s + D] / (s - 5) - (2s + 7) / (s^2 + 25)
Multiplying both sides by the denominator (s^2 - 25), we get:
[tex]As^3 + Bs^2 - 5As^2 - 5Bs + Cs^3 - Ds^2 - 5Cs + 5D - (2s + 7)(s^2 - 25) = 5[/tex]
Simplifying and equating the coefficients of the like powers of s on both sides, we get:
A + C = 0
B - 5A - D + 50 = 0
5B - 5C - 2 = 0
Solving these equations, we get:
A = -C
B = 20/9
C = -20/9
D = -7/9
Substituting these values, we get:
Y = [-20s/9 - 20/9] / (s + 5) + [20s/9 + 7/9] / (s - 5) - (2s + 7) / (s^2 + 25)
Taking the inverse Laplace transform, we get the solution y(t):
y(t) = [-20/9 exp(-5t) - 20/9] + [20/9 exp(5t) + 7/9] cos(5t) - (2/5) sin(5t)
Therefore, the equation obtained by taking the Laplace transform of the given initial value problem is:
Y = [5 / (s^2 + 25) - 2s - 7] / ([tex]s^2 - 25[/tex])
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Joe began reading at
9:04. He read for 47
minutes. What time did
he finish reading?
Answers
Answer: 9:51
Step-by-step explanation:
"In each case suppose R"" has usual norm. Decide whether the statement is true and give a reason for your answer: (a) In R, 2 € B.(-2) (b) In R. -1.5 € B (0) c) In R(1,5,0.5) € B.(-1,0) (d) In R."
Answers
This statement is incomplete and does not make sense. It cannot be evaluated as true or false without more information.
(a) In R, 2 € B.(-2)
False.
Explanation: The statement means that 2 is an element of the closed ball centered at -2 with radius 1. But this is not true since the distance between 2 and -2 is greater than 1 (|2 - (-2)| = 4).
(b) In R, -1.5 € B(0)
True.
Explanation: The statement means that -1.5 is an element of the closed ball centered at 0 with radius 1. Since the distance between -1.5 and 0 is less than 1 (|-1.5 - 0| = 1.5 < 1), the statement is true.
(c) In R(1,5,0.5) € B(-1,0)
False.
Explanation: The statement means that (1,5,0.5) is an element of the closed ball centered at (-1,0) with radius 1. But the distance between these two points is greater than 1, since
d((1,5,0.5), (-1,0)) = √[(1-(-1))^2 + (5-0)^2 + (0.5-0)^2] = √[4+25+0.25] = √29.25 > 1.
(d) In R.
True.
Explanation: This statement is incomplete and does not make sense. It cannot be evaluated as true or false without more information.
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if a contractionary fiscal policy is followed by an expansionary monetary policy, nominal interest rate and employment would most likely be affected in which of the following ways in the short run?
Answers
In the short run, if a contractionary fiscal policy is followed by an expansionary monetary policy, the nominal interest rate is likely to decrease and employment is likely to increase.
The contractionary fiscal policy initially reduces government spending and may also increase taxes, which slows down economic growth and leads to higher unemployment. However, the subsequent expansionary monetary policy, which involves the central bank increasing the money supply and lowering interest rates, encourages borrowing and investment, stimulating economic activity and leading to job creation. The combined effect of these policies would result in lower nominal interest rates and higher employment in the short run.
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An analysis of variance is used to evaluate the mean differences for a research study comparing four treatment conditions with a separate sample of n = 5 in each treatment. The analysis produces SSwithin treatments = 32, SSbetween treatments = 40, and SStotal = 72 For this analysis, what is MSwithin treatments?
Answers
The MSwithin treatments for this analysis is 2.
In analysis of variance (ANOVA), we partition the total variation in a set of data into two types of variation: variation within groups and variation between groups. This partitioning helps us to test whether the means of the groups are significantly different from each other or not.
The formula for calculating the mean square within treatments (MSW) is:
MSW = SSW / dfW
where SSW is the sum of squares within treatments and dfW is the degrees of freedom associated with the SSW.
To calculate MSW, we first need to calculate dfW, which is equal to the total number of observations minus the total number of groups. In this case, there are 4 groups, each with 5 observations, so there are a total of 20 observations:
dfW = 20 - 4 = 16
Next, we can use the given SSwithin treatments value of 32 to calculate SSW:
SSW = 32
Finally, we can plug in the values we have calculated to find MSW:
MSW = SSW / dfW
MSW = 32 / 16
MSW = 2
Therefore, the MSwithin treatments for this analysis is 2.
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Angle xzw ~ to angle xvy, find the perimeter of angle xzw
Answers
The perimeter of the triangle XZW is 176.4 units
Finding the perimeter of triangle XZWFrom the question, we have the following parameters that can be used in our computation:
The similar triangles
We start by calculating the missing side lengths using proportions
So, we have
YZ/32 = 28/40
So, we have
YZ = 32 * 28/40
YZ = 22.4
Next, we have
30/WZ = 40/(40 + 32)
So, we have
WZ = 30 * (40 + 32)/40
WZ = 54
The perimeter of triangle XZW is
P = 28 + 22.4 + 54 + 32 + 40
Evaluate
P = 176.4
Hence, the perimeter is 176.4 units
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PLS HELP ASAP THANKS
Answers
The description of the parabola of the quadratic function is:
It opens upwards and is thinner than the parent function
How to describe the quadratic function?The general formula for expressing a quadratic equation in standard form is:
y = ax² + bx + c
Quadratic equation In vertex form is:
y = a(x − h)² + k .
In both forms, y is the y -coordinate, x is the x -coordinate, and a is the constant that tells you whether the parabola is facing up ( + a ) or down ( − a ), (h, k) are coordinates of the vertex
In this case, a is positive and as such it indicates that it opens upwards and is thinner than the parent function
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A group of 125 pick up truck owners were asked what brand truck they owned and whether it had four-wheel drive. The results are given in the two-way table.
You randomly select one truck owner. Which one of the following is true about the events "Owner has a Chevy" and "Owner's truck has four-wheel drive"?
These two events are mutually exclusive and independent.
These two events are mutually exclusive, but not independent.
These two events are not mutually exclusive, but they are independent.
These two events are neither mutually exclusive nor independent.
Answers
These two events are not mutually exclusive, but they are not independent.
To determine the relationship between the two events, "Owner has a Chevy" and "Owner's truck has four-wheel drive," it is necessary to analyze the information provided in the two-way table. Unfortunately, the table is not included in your question.
1. Mutually exclusive: Two events are mutually exclusive if the occurrence of one event excludes the occurrence of the other event. In other words, they cannot happen at the same time.
2. Independent: Two events are independent if the occurrence of one event does not affect the probability of the other event occurring.
After analyzing the two-way table, you should be able to determine if these events are mutually exclusive, independent, or neither.
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If you have $50,000 today and deflation is 5% each year. How much would you need in 20 years to have the same buying power?
Use the formula: A=P(1-r)1^
A 103,946,41
B 23,164,56
C 132,664,89
D 17,924,30
Answers
You would need about $17,924.30 in 20 years to have the same buying power as $50,000 today, assuming a 5% annual deflation rate.
Option D is the correct answer.
We have,
To calculate the future value of money adjusted for deflation, we can use the formula:
A = P(1 - r)^n
Where:
A = future value of money
P = present value of money
r = deflation rate
n = number of years
Plugging in the given values, we get:
A = 50,000(1 - 0.05)^20
Simplifying the expression inside the parentheses:
A = 50,000(0.95)^20
A ≈ 17,924.30
Therefore,
You would need about $17,924.30 in 20 years to have the same buying power as $50,000 today, assuming a 5% annual deflation rate.
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Use the given confidence interval to find the margin of error
and the sample proportion.
(0.622,0.652)
Question content area bottom
Part 1
E=
Part 2
p=
Answers
Margin of error (E) is 0.015 and proportion (p) is 0.637.
We are given the confidence interval (0.622, 0.652) and we need to find the margin of error (E) and the sample proportion (p).
Part 1: Margin of error (E) 1. Calculate the midpoint of the confidence interval by adding the lower limit (0.622) and the upper limit (0.652), then divide by 2: Midpoint = (0.622 + 0.652) / 2 = 1.274 / 2 = 0.637 2.
Find the margin of error (E) by subtracting the midpoint from the upper limit (or lower limit, it should give the same value): E = 0.652 - 0.637 = 0.015
Part 2: Sample proportion (p) 3. The midpoint we calculated earlier is the sample proportion (p): p = 0.637
Your answer: Part 1 E = 0.015 Part 2 p = 0.637
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How does the graph of f(x) = (x − 8)^3 + 4 compare to the parent function g(x) = x^3? SHOW WORK!!!!!
Answers
Answer:
Step-by-step explanation:
g(x) = x^3 is the parent function starting at the origin (0,0)
f(x) is the translation of the g(x).
Your teacher taught you that y = (x - h)^3 + k
(h,k) is your shift.
(8,4) meaning right 8 on the x-axis and 4 up on the y-axis.
You are asked to estimate the water flow rate in a pipe of radius 2m at a remote area location with a harsh environment. You already know that velocity v varies along the radial location, but you do not know how it varies. The flow rate Q is given by
Q = ∫(0 to 2) 2 π r v dr
To save money, you are allowed to put only two velocity probes (these probes send the data to the central office in New York by satellite). Radial location r is measured from center of the pipe, i.e., r = 0 is the center of the pipe, and r = 2m is the pipe radius. The radial locations you will suggest for the two velocity probes for the most accurate calculation of the flow rate are
0.42, 1.42
0.00, 1.00
0.42, 1.58
0.58, 1.58
Answers
To estimate the water flow rate in the pipe, we need to measure the velocity at two radial locations and then use the integral formula to calculate the flow rate. The formula tells us that the flow rate is equal to the integral of 2πrv with respect to r, where r is the radial location, v is the velocity, and the limits of integration are 0 to 2 (since the pipe has a radius of 2m).
Since we don't know how the velocity varies along the radial location, we need to choose two locations that will give us the most accurate estimate of the flow rate. The best locations to choose are where the velocity varies the most, which is usually near the center and near the edge of the pipe.
Based on this, the two radial locations that would give us the most accurate calculation of the flow rate are 0.42 and 1.58. These locations are close to the center and the edge of the pipe, respectively, and will give us a good estimate of how the velocity varies along the radial location.
Therefore, the answer is 0.42, 1.58.
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Hey can anyone help me
Answers
Answer: 12 units
Step-by-step explanation:
Since in this situation we're going by units it will be easier. First to create the rectangle just fill in 3 boxes horizontally and 4 units vertically. connect the squares together.
Then to find the area, the formula for that is Base x Height so all you have to do is multiply 4*3 and that's 12.
Shannon’s Ice Cream Shop, Shenanigans, sells three types of ice cream: Peanut Butter Cup, Coffee Cream and Oreo. Last week Shenanigans sold a total of 489 ice cream cones that were either Coffee Cream or Oreo. In total, they sold 711 ice cream cones last week. What is the probability Shenanigan’s will sell a Peanut Butter Cup cone next? Express your answer as a percent.
Answers
The probability of Shenanigans selling a Peanut Butter Cup cone next is approximately 31.22%.
To calculate the probability of Shenanigans selling a Peanut Butter Cup cone next, we need to determine the number of cones sold that were not Peanut Butter Cup cones and divide that by the total number of cones sold.
Given that Shenanigans sold a total of 711 ice cream cones last week and 489 of those were either Coffee Cream or Oreo, we can subtract 489 from 711 to find the number of cones that were not Coffee Cream or Oreo;
Number of cones that were not Coffee Cream or Oreo = 711 - 489 = 222
So, out of the total 711 cones sold, 222 were not Coffee Cream or Oreo cones. Therefore, the remaining cones must be Peanut Butter Cup cones.
Now, we can calculate the probability of selling a Peanut Butter Cup cone next by dividing the number of Peanut Butter Cup cones by the total number of cones sold, and then multiplying by 100 to find the result as a percentage;
Probability of selling a Peanut Butter Cup cone next = (Number of Peanut Butter Cup cones / Total number of cones sold) × 100
Probability of selling a Peanut Butter Cup cone next = (222 / 711) × 100
≈ 31.22%
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100 PTS solve for x ................
Answers
Answer:
x ≈ 36.2
Step-by-step explanation:
the segment from the vertex of the triangle to the base is a perpendicular bisector, then
consider the right triangle on the right with legs 15 and 33 , hypotenuse x
using Pythagoras' identity in the right triangle
x² = 15² + 33² = 225 + 1089 = 1314 ( take square root of both sides )
x = [tex]\sqrt{1314}[/tex] ≈ 36.2 ( to the nearest tenth )
Answer:
36.2
Step-by-step explanation:
The tick marks on the two sides of the triangle indicate that the sides are of equal length. Therefore, as the triangle has two sides of equal length, it is an isosceles triangle.
In an isosceles triangle, the altitude is the perpendicular bisector of the base. Therefore, the triangle is made up of two congruent right triangles with:
height = 33base = 30/2 = 15hypotenuse = xTo calculate the value of x, we can use Pythagoras Theorem:
[tex]\boxed{a^2+b^2=c^2}[/tex]
where:
a and b are the legs of the right triangle.c is the hypotenuse (longest side) of the right triangle.Substitute the values into the formula and solve for x:
[tex]\implies 15^2+33^2=x^2[/tex]
[tex]\implies 225+1089=x^2[/tex]
[tex]\implies 1314=x^2[/tex]
[tex]\implies x^2=1314[/tex]
[tex]\implies \sqrt{x^2}=\sqrt{1314}[/tex]
[tex]\implies x=36.2491379...[/tex]
[tex]\implies x=36.2\; \rm (nearest\;tenth)[/tex]
Therefore, the value of x is 36.2 units (nearest tenth).
How do I solve this in excel?
Use the data for pre- and post- grades provided.
Apply the Excel Regression tool using the Pre-Test grade as the independent variable and the Post-Test grade as the dependent variable.
Please answer the following questions on the worksheet labeled Problem 1 Questions that is located directly after the worksheet labeled Problem 1.
a. In complete sentences, please write your interpretation of the following:
1. The regression results.
2. The hypothesis tests.
3. The confidence intervals.
b. Based on the residuals, are the assumptions underlying the regression analysis valid?
• See Checking Assumptions on page 247 in the textbook.
• See *Note below.
c. Based on the standard residuals, do any outliers exist?
Answers
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Write the notations for these compositions of transformations. I will mark brainliest
Answers
The final coordinates after the given transformation is:
A) (-(x + 2), -y)
B) (0, 5)
How to interpret the transformation?A) When the coordinate (x, y) is mapped by a reflection about the line x = 2, we note:
(1) The y-coordinate is unaffected.
(2) For reflections the distance from the line of reflection to the object is equal to the distance to the image point.
∴ a = 2 + 2 = 4 units
Thus, the image point is 4 units from the line of reflection
The new coordinate is:
((x + 2), y)
The rule for a rotation by 180° about the origin is: (x, y) → (−x, −y) .
The final transformation is: (-(x + 2), -y)
2) Sequel to the translation, the coordinate is (0, 5).
Now, if the point (x, y) is reflected across the line y = a, then the relation between coordinates of actual point and image point will be:
(x, y) → (x, 2a − y) .
Thus, a reflection around the line y = 5 gives:
(0, 2(5) - 5) = (0, 5)
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"Evaluate the following continuous-time convolution integrals
(k) y(t)=e-yt u (t) x (u(t+2)-u(t))
This question is in the Signals and Sysytems 2nd edition."
Answers
The continuous-time convolution integral of y(t) is [tex]$y(t) = k e^{-yt} u(t) * (u(t+2)-u(t))$[/tex].
To evaluate this convolution integral, we first need to express the integrand as a piecewise function. Since u(t) is 1 for t >= 0 and 0 for t < 0, we can rewrite u(t+2)-u(t) as a piecewise function:
u(t+2)-u(t) =
1, 0 <= t < 2
0, t >= 2
0, t < 0
Now we can evaluate the convolution integral using the definition:
y(t) = ∫[tex]_0^t[/tex] x(τ)h(t-τ)dτ
Substituting the given functions for x(t) and h(t) and simplifying using the piecewise function for u(t+2)-u(t), we get:
y(t) = k ∫[tex]_0^t[/tex] [tex]e^}(-yt)}[/tex]dτ = [tex]k[-(1/y)e^{(-yt)}]_0^t = k(1 - e^{(-yt)})/y[/tex], t >= 0
Therefore, the continuous-time convolution integral of y(t) is [tex]$y(t) = k e^{-yt} u(t) * (u(t+2)-u(t))$[/tex] for t >= 0.
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Solve for x.
4x = 36
x = [?]
Answers
Answer:
Step-by-step explanation:
4x is in a multiplication form
4x=36
meaning a number when multiplied with 4 gives the answer 36
hence in order to find the answer
36 divided by 4 which is equivalent to 9
answer is 9
Answer: [tex]x = 9[/tex]
Step-by-step explanation:
We must isolate [tex]x[/tex] on one side of the equation in order to solve the equation [tex]4x = 36[/tex] for [tex]x[/tex].
Step 1: Divide both sides of equation by 4:
[tex]\frac{4x}{4} = \frac{36}{4}[/tex]
Step 2: Simplify
[tex]x = 9[/tex]
Therefore, the solution to the equation is [tex]x = 9[/tex].
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FAQWhat does isolating x mean?Rearranging an algebraic equation so that [tex]x[/tex] is on one side and all other terms are on the other side of the equal sign is known as isolating [tex]x[/tex].
Select the correct answer.
Amy constructed this figure by using a compass to draw circle C and then a straightedge to draw diameter AB through point C. Then, with the compass still set equal to the radius of the circle, Amy drew two arcs centered at point B and labeled the points of intersection D and E. She used the straightedge to draw chords AD, AE, and DE.
A circle has an arc at its center and is labeled C. Three points A D and E complete a triangle. The diameter is A B through point C. Two broken lines are drawn from C to D and D to B.
Amy notes that arcs ADB and AEB are semicircles and that ΔBDC is equilateral. Because ∠BCD is a central angle, she can say that
= 60°. She uses these facts to determine
=
=
= 120°. Finally, she concludes ΔADE is equilateral because congruent arcs are intercepted by congruent chords.
Why is ΔBDC is equilateral?
A.
Triangle BDC is equilateral because diameter AB is a perpendicular bisector of chord BD.
B.
Triangle BDC is equilateral because arcs BD and BE are two arcs with the same radius and center.
C.
Triangle BDC is equilateral because the sum of the three angle measures in ΔADE is the same as the measure of a semicircle.
D.
Triangle BDC is equilateral because the distance between all three vertices is equal to the radius of the circle.
Answers
The reason why ΔBDC is equilateral include the following: D. Triangle BDC is equilateral because the distance between all three vertices is equal to the radius of the circle.
What is an equilateral triangle?In Mathematics, an equilateral triangle can be defined as a special type of triangle that has equal side lengths and all of its three (3) interior angles are equal.
In order to determine whether the triangle with any given vertices is an equilateral triangle, we would apply the distance formula to calculate the length of each side of this triangle.
In conclusion, we can logically deduce that the triangle with these vertices is an equilateral triangle because C = A = B i.e "the distance between all three vertices is equal to the radius of the circle."
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The current of a system is defined as the following function i(t) = Ae-1-1-1 Evaluate the rate of change of the current at time t = 0.01s and A = 20 0 28.79 O 18.79 O 10.79 O None 0 20.79
Answers
The rate of change of the current is -19.79.
You provided the function i(t) = Ae^(-t) and you'd like to evaluate the rate of change of the current at time t = 0.01s with A = 20.
Step 1: Find the derivative of the function i(t) with respect to time (t). This will give us the rate of change.
di/dt = -Ae^(-t)
Step 2: Substitute the given values for A and t into the derivative equation.
di/dt = -20e^(-0.01)
Step 3: Evaluate the expression.
di/dt ≈ -20 * 0.99004983 ≈ -19.79
So, the rate of change of the current at time t = 0.01s and A = 20 is approximately -19.79.
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Archie invests $27000 into his savings account with an interest rate of 2. 25% compounded monthly. What’s Archie’s balance of his savings account after 8 years?
Answers
Archie's balance in his savings account after 8 years with an interest rate of 2. 25% is approximately $33,030.19.
To calculate the balance of Archie's savings account after 8 years, we can use the formula:
[tex]A = P(1 + r/n)^{(nt)}[/tex]where A is the final amount, P is the principal (initial amount invested), r is the annual interest rate (as a decimal), n is the number of times the interest is compounded per year, and t is the number of years.
Substituting the given values, we get:
A = 27000(1 + 0.0225/12)⁽¹²ˣ⁸⁾
Simplifying, we get:
A = 27000(1.001875)⁹⁶
A = 27000(1.22034)
A = 33030.19
Therefore, Archie's balance in his savings account after 8 years is approximately $33,030.19.
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Need the answer asap
Answers
Answer:
54
Step-by-step explanation:
Multiply each number by 3
What is the value of −2(7/5÷14)?
Answers
Answer:
-0.2
Step-by-step explanation:
the priority is for the parenthesis
7÷5÷14= 0.1
0.1×-2 = -0.2
What number must be added to 101 to produce a number equal to the product of 101 × 21?
Answers
Answer: 2020
Step-by-step explanation:
101 x 21 = 2121
let x be the number to be added:
101 + x = 2121
x = 2121 - 101
x = 2020
thats your answer :)
Answer:2121
Step-by-step explanation:
Let A = {1,2,3,4}, give an example of a relation on A|| that is • reflexive and symmetric but not transitive. You may give your example in the form R = {(x,y),(y,w), (w,y), ... } or draw a directed graph reflexive and transitive but not symmetric. You may give your example in the form R = {(x,y),(y,w),(w,y),... } or draw a directed graph
Answers
For the first part of the question, let R = {(1,1), (2,2), (3,3), (4,4), (1,2), (2,1), (2,3), (3,2)}. This relation is reflexive because every element in A is related to itself, and it is symmetric because if (x,y) is in R, then (y,x) is also in R. However, it is not transitive because (1,2) and (2,3) are in R, but (1,3) is not in R.
For the second part of the question, let R = {(1,1), (2,2), (3,3), (4,4), (1,2), (2,3), (3,4), (1,3), (2,4)}. This relation is reflexive because every element in A is related to itself, and it is transitive because if (x,y) and (y,z) are in R, then (x,z) is also in R. However, it is not symmetric because (1,2) is in R, but (2,1) is not in R.
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