You have planted a wheat crop and are checking the plant population. if you have a row spacing of 25 cm and there are 35 plants along a 1 m row (i.e. per linear meter) . how many plants are there per m square ?

Answer:

To prove that n^3 + 3n + 4 is Θ(2^n), we need to show that it is both O(2^n) and Ω(2^n).

First, let's show that it is O(2^n). To do this, we need to find constants c and n0 such that n^3 + 3n + 4 <= c * 2^n for all n >= n0.

We can start by simplifying the left-hand side: n^3 + 3n + 4 <= n^3 + n^3 + n^3 (since 3n <= n^3 and 4 <= n^3 for all n >= 1).

So we have: n^3 + 3n + 4 <= 3n^3

Now, for n >= 1, we know that 2^n <= 3^n, so we can write: 3n^3 >= 2^n

Therefore, we have: n^3 + 3n + 4 <= 3n^3 <= c * 2^n for c = 3 and n0 = 1.

So, n^3 + 3n + 4 is O(2^n).

Next, let's show that it is Ω(2^n). To do this, we need to find constants c and n0 such that n^3 + 3n + 4 >= c * 2^n for all n >= n0.

One way to approach this is to try to find a lower bound for n^3 + 3n + 4 by removing some terms (because we want to show that the left-hand side is at least as big as some constant times 2^n, and the more terms we have on the left-hand side, the harder that is to do).

If we remove the 3n and the 4, we have n^3 <= n^3.

If we remove only the 4, we have n^3 + 3n >= n^3.

Either way, we have: n^3 + 3n >= n^3 >= c * 2^n for c = 1 and n0 = 1.

Therefore, n^3 + 3n + 4 is Ω(2^n).

Since we have shown that n^3 + 3n + 4 is both O(2^n) and Ω(2^n), we can conclude

Step-by-step explanation:

We have shown that n^3 + 3n + 4 is in the order of e(2n^3), as required.

To prove that n^3 + 3n + 4 is in the order of e(2n^3), we need to show that there exist positive constants c and n0 such that:

n^3 + 3n + 4 <= c * e(2n^3) for all n >= n0

Taking natural logarithm on both sides of the inequality, we get:

ln(n^3 + 3n + 4) <= ln(c) + 2n^3

Now, we need to show that there exist positive constants c and n0 such that the inequality holds.

Taking the derivative of the left-hand side of the inequality, we get:

d/dn (ln(n^3 + 3n + 4)) = (3n^2 + 3) / (n^3 + 3n + 4)

For n >= 1, we have:

3n^2 + 3 <= 3n^3 + 3n^2 <= 6n^3

n^3 + 3n + 4 >= n^3

Therefore,

d/dn (ln(n^3 + 3n + 4)) <= (6n^3) / n^3 = 6

This means that the function ln(n^3 + 3n + 4) is bounded above by a constant of 6. Thus, we can set c = e^6 and n0 = 1.

For all n >= 1, we have:

ln(n^3 + 3n + 4) <= 6 + 2n^3

n^3 + 3n + 4 <= e^(6 + 2n^3) = e^6 * e^(2n^3)

Therefore, we have shown that n^3 + 3n + 4 is in the order of e(2n^3), as required.

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Answer: A 4 digit PIN number is selected. What is the probability that there are no repeated digits? ... There are 10 possible values for each digit of the PIN (namely: 0 ..

Step-by-step explanation:

The probability of receiving more than 5 calls during the next 15 minutes is approximately 0.0322.

To solve this problem, we will use the Poisson probability distribution formula, which is:

P(X = k) = (e^(-λ) * λ^k) / k!

where:

P(X = k) is the probability of getting k events in a specific time interval

e is Euler's number (approximately equal to 2.71828)

λ is the average rate of events per interval (also known as the Poisson parameter)

k is the number of events we want to calculate the probability for

k! is the factorial of k (i.e., k! = k x (k-1) x (k-2) x ... x 2 x 1)

In this problem, we are given that the rate of calls to a customer service center follows a Poisson process with a rate of 1 call every 3 minutes. Therefore, the average rate of calls per minute (i.e., λ) is:

λ = 1 call / 3 minutes = 1/3 calls per minute

Now, we want to find the probability of receiving more than 5 calls during the next 15 minutes. We can use the Poisson formula to calculate this probability as follows:

P(X > 5) = 1 - P(X ≤ 5)

= 1 - ∑(k=0 to 5) [e^(-λ) * λ^k / k!]

= 1 - [(e^(-λ) * λ^0 / 0!) + (e^(-λ) * λ^1 / 1!) + ... + (e^(-λ) * λ^5 / 5!)]

Substituting λ = 1/3 and simplifying the equation, we get:

P(X > 5) = 1 - [(e^(-1/3) * 1^0 / 0!) + (e^(-1/3) * 1^1 / 1!) + ... + (e^(-1/3) * 1^5 / 5!)]

≈ 0.0322

Therefore, the probability of receiving more than 5 calls during the next 15 minutes is approximately 0.0322.

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The estimated value of λ and x = 2.91, we get:

P(1.2 ≤ median load ≤ 6) = 1 - e^(-0.38*2.91) - (

2.2.1 To calculate the probability that the maximum load is at least 3, we first need to find the distribution of the maximum load. Let X be the random variable representing the loads. Then the probability that the maximum load is less than or equal to x is given by:

P(X ≤ x)^n = (1 - e^(-λx))^n

where n is the sample size. Taking the derivative of this expression with respect to x and setting it equal to zero, we get:

n(1 - e^(-λx))^(n-1)λe^(-λx) = 0

Solving for x, we get

x = -ln(1 - 1/n)/λ

Now, we can calculate the probability that the maximum load is at least 3 as follows:

P(X ≤ 3)^n = (1 - e^(-λ*3))^n

P(maximum load ≥ 3) = 1 - P(X ≤ 3)^n

Substituting the estimated value of λ (sample variance of the loads) and the sample size n = 5, we get:

P(maximum load ≥ 3) = 1 - (1 - e^(-0.38*3))^5 ≈ 0.578

Therefore, the probability that the maximum load is at least 3 is approximately 0.578.

2.2.2 To calculate the probability that the minimum load is no more than 4.11, we can use the same approach as in 2.2.1, but with the inequality flipped:

P(minimum load ≤ 4.11) = 1 - P(X ≥ 4.11)^n

where we need to find the distribution of the minimum load. The probability that the minimum load is greater than or equal to x is given by:

P(X ≥ x) = e^(-λx)

Substituting the estimated value of λ and x = 4.11, we get:

P(minimum load ≤ 4.11) = 1 - e^(-0.38*4.11) ≈ 0.448

Therefore, the probability that the minimum load is no more than 4.11 is approximately 0.448.

2.2.3 To calculate the probability that the median load is between 1.2 and 6, we first need to estimate the median load from the sample. The sample is already sorted as 2.39, 2.51, 2.91, 3.08, 3.11. The median load is the middle value, which is 2.91.

The probability that the median load is less than or equal to x is given by:

P(median load ≤ x) = P(X1 ≤ x, X2 ≤ x, X3 ≥ x, X4 ≥ x, X5 ≥ x) + P(X1 ≤ x, X2 ≤ x, X3 ≥ x, X4 ≥ x, X5 ≤ x) + P(X1 ≤ x, X2 ≤ x, X3 ≥ x, X4 ≤ x, X5 ≥ x)

where Xi represents the ith load in the sample. The probability that the median load is between 1.2 and 6 is then given by:

P(1.2 ≤ median load ≤ 6) = P(median load ≤ 6) - P(median load ≤ 1.2)

Substituting the estimated value of λ and x = 2.91, we get:

P(1.2 ≤ median load ≤ 6) = 1 - e^(-0.38*2.91) - (

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Answer: 18/14 or 18:14

Step-by-step explanation: this is relatively simple you have 32 in all and 14 are blue so 32-14=18 now you know there are 18 red marbles now to set up the ratio 18/14 or 18:14 (to check your work add 18+14=32)

The probability of the arrow landing on an odd number is the number of odd numbers divided by the total number of possible outcomes. Therefore, the probability of the arrow landing on an odd number is  0.5 or 50%.


To find the probability that the arrow will point at an odd number on a circular board with 8 equal parts, we'll first determine the total number of odd numbers present and then divide that by the total number of possible outcomes.

Step 1: Identify the odd numbers on the board. They are 1, 3, 5, and 7. The game consists of spinning the arrow on a circular board with 8 equal parts, which means there are 8 possible outcomes or numbers. Since we want to know the probability of landing on an odd number, we need to count how many odd numbers are on the board. In this case, there are four odd numbers: 1, 3, 5, and 7.

Step 2: Count the total number of odd numbers. There are 4 odd numbers.

Step 3: Count the total number of possible outcomes. Since the board is divided into 8 equal parts, there are 8 possible outcomes.

Step 4: Calculate the probability. The probability of the arrow pointing at an odd number is the number of odd numbers divided by the total number of possible outcomes.

Probability = (Number of odd numbers) / (Total number of possible outcomes)
Probability of landing on an odd number = Number of odd numbers / Total number of possible outcomes
Probability of landing on an odd number = 4 / 8

Step 5: Simplify the fraction. The probability of the arrow pointing at an odd number is 1/2 or 50%.

So, the probability that the arrow will point at an odd number is 1/2 or 50%.

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Answer:

Step-by-step explanation:

Your answer is correct

8 + v = 26

v +8 -8 = 26 - 8

v = 18

Answer: V=18

Step-by-step explanation:

PEMDAS can be used to solve this problem. PEMDAS stands for parentheses, exponents, multiplication, division, addition, and subtraction. You see that there are no parentheses, exponents, or multiplication/division steps so you have addition left. To solve 26=8+v, you have to isolate the variable by subtracting the 8 on both sides of the equation. 26-8 is 18, so, the final equation is v=18.

a) The random variable in this study is the difference in system failures before and after applying the software patch for each installation.

b) Null hypothesis (H0): There is no significant difference in system failures before and after applying the software patch.
c) Alternative hypothesis (H1): There is a significant difference in system failures before and after applying the software patch.

d) The p-value of approximately 0.0034.

e) The software patch is effective in reducing system failures.

We have,
a)

What is the random variable?
The random variable in this study is the difference in system failures before and after applying the software patch for each installation.

b)
State the null and alternative hypotheses.
Null hypothesis (H0): There is no significant difference in system failures before and after applying the software patch.
Alternative hypothesis (H1): There is a significant difference in system failures before and after applying the software patch.

Now, let's calculate the differences and their mean and standard deviation to find the t-statistic and p-value:
Differences: 2, 1, 2, 2, 4, 8, 0, 4
Mean (µ) = (2+1+2+2+4+8+0+4)/8 = 23/8 = 2.875
Standard Deviation (σ) = √[((2-2.875)^2 + (1-2.875)^2 + ... + (4-2.875)^2)/7] = 2.031009
Standard Error (SE) = σ/√n = 2.031009/√8 = 0.718185

t-statistic = (µ - 0)/SE = (2.875 - 0)/0.718185 = 4.004006

c)

What is the p-value?
Since we are testing at the 1% significance level and it's a two-tailed test, we need to find the p-value for a t-statistic of 4.004006 with 7 degrees of freedom.

Using a t-distribution table or calculator, we get a p-value of approximately 0.0034.

d)

What conclusion can you draw about the software patch?
Since the p-value (0.0034) is less than the 1% significance level (0.01), we reject the null hypothesis.

This means that there is a significant difference in system failures before and after applying the software patch, indicating that the software patch is effective in reducing system failures.

Thus,

a) The random variable in this study is the difference in system failures before and after applying the software patch for each installation.

b) Null hypothesis (H0): There is no significant difference in system failures before and after applying the software patch.
c) Alternative hypothesis (H1): There is a significant difference in system failures before and after applying the software patch.

d) The p-value of approximately 0.0034.

e) The software patch is effective in reducing system failures.

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Answer:

There is only one way to obtain a sum of 12 when rolling two standard six-sided dice, which is to get a 6 on both dice.

The probability of rolling a 6 on one die is 1/6. Therefore, the probability of rolling a 6 on both dice is:

P(D1 = 6 and D2 = 6) = P(D1 = 6) x P(D2 = 6) = 1/6 x 1/6 = 1/36

Therefore, the probability of rolling a sum of 12 with two standard six-sided dice is 1/36.

P(D1 + D2 = 12) = 1/36

IF THIS HELPS, CAN YOU PLEASE GIVE MY ANSWER BRAINLIEST?:)

The two figures are not similar and hence will not exactly map to each other

In math, two polygons qualify as similar only under the following condition:

In the polygon the ratio of the sides are not proportional. the sides are

Red: 3 units x 3 units

Blue: 1.5 units x 4 units

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The closest answer is B. None of these

To find the present value of an income of Rs. 3 lakhs to be received after 1 year at a 5% rate of interest, you can use the present value formula:

Present Value (PV) = Future Value (FV) / (1 + Interest Rate) ^ Number of Years

1. Repeat the question in your answer: The present value of an income of Rs. 3 lakhs to be received after 1 year at a 5% rate of interest is:

2. Step-by-step explanation:

Step 1: Identify the values for the formula.
- Future Value (FV) = Rs. 3 lakhs
- Interest Rate = 5% or 0.05
- Number of Years = 1

Step 2: Plug the values into the formula.
PV = Rs. 3,00,000 / (1 + 0.05) ^ 1

Step 3: Calculate the present value.
PV = Rs. 3,00,000 / 1.05

PV ≈ Rs. 2,85,714.29

Based on the given options, the closest answer is B. None of these, as the calculated present value is approximately Rs. 2,85,714.29, which does not match any of the provided options.

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Yes, repeating two simple arithmetic operations will eventually transform every positive integer into 1.

From the question, we have the following parameters that can be used in our computation:

f(n) = n/2 if n%2 = 0

f(n) = 3n + 1 if n%2 = 1

The above definition means that

f(n) = n/2 if n is even

f(n) = 3n + 1 if n is odd

To check if repeating operations would transform to 1, we can set n = 10

and then evaluate the function values

So, we have

f(10) = 10/2 = 5

f(5) = 3(5) + 1 = 16

f(16) = 16/2 = 8

f(8) = 8/2 = 4

f(4) = 4/2 = 2

f(2) = 2/2 = 1

See that the end result of the operations is 1

Hence, repeating two operations will transform every positive integer into 1

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The coordinate matrix of the vector in the S' basis is [5/2 5/2]t.

(a) To verify that S and S' are bases, we need to check that they are linearly independent and span R^2.

First, we check if S is linearly independent:

c1 [2 1] + c2 [1 2] = [0 0] has only the trivial solution c1 = 0 and c2 = 0, which means that S is linearly independent.

Next, we check if S spans R^2. Since S has two vectors and R^2 is two-dimensional, it is enough to show that the two vectors in S are not collinear. We can see that [2 1] and [1 2] are not collinear, so S spans R^2.

Similarly, we can check that S' is linearly independent:

c1 [1 0] + c2 [1 1] = [0 0] has only the trivial solution c1 = 0 and c2 = 0, which means that S' is linearly independent.

We can also check that S' spans R^2:

Any vector [a b] in R^2 can be written as [a b] = (a-b)/2 [1 0] + (a+b)/2 [1 1], which shows that S' spans R^2.

Therefore, S and S' are bases of R^2.

(b) To compute the transition matrices Ps-s and Ps+s, we need to find the coordinate matrices of the vectors in S and S' with respect to each other. We can use the formula [v]s = Ps,t [v]t, where Ps,t is the transition matrix from basis t to basis s.

To find Ps-s, we need to express the vectors in S in terms of S':

[2 1] = (1/2) [1 0] + (1/2) [1 1]

[1 2] = (-1/2) [1 0] + (3/2) [1 1]

Therefore, the transition matrix Ps-s is:

Ps-s = [1/2 -1/2]

[1/2 3/2]

To find Ps+s, we need to express the vectors in S' in terms of S:

[1 0] = (2/3) [2 1] - (1/3) [1 2]

[1 1] = (1/3) [2 1] + (2/3) [1 2]

Therefore, the transition matrix Ps+s is:

Ps+s = [2/3 1/3]

[-1/3 2/3]

(c) Given the coordinate matrix [3 2]s of a vector in the S basis, we can use the formula [v]s' = (Ps-s)^(-1) [v]s to find its coordinate matrix in the S' basis:

[v]s' = (Ps-s)^(-1) [3 2]s

= [1/2 1/2] [3 2]t

= [5/2 5/2]t

Therefore, the coordinate matrix of the vector in the S' basis is [5/2 5/2]t.

(d) Given the coordinate matrix [3 2]s' of a vector in the S' basis, we can use the formula [v]s = (Ps+s)^(-1) [v]s' to find its coordinate matrix in the S basis:

[v]s = (Ps+s)^(-1) [3 2]s'

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The dot product of u.v is  -87.

The dot product, also called scalar product, is a the sum of the products of corresponding components. measure of closely two vectors align, in terms of the directions they point.

If we have 2 vectors

A= ⟨a, b⟩

and B =  ⟨c, d⟩

The dot product is

A . B = ⟨a, b⟩ . ⟨c, d⟩ = ac + bd

Here, u = 4i − 7j and v = −6i + 9j

The dot product is:

u . v = ( 4 ,− 7 ). ( −6 , 9)

u . v= 4 . (-6) + (-7). (9)

u. v = -24 - 63

u. v = -87

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Answer:

Step-by-step explanation:

Answer:

Set your calculator to degree mode.

cos(48°) = y/35

y = 35cos(48°)

tan(20°) = x / 35cos(48°)

x = 35cos(48°)tan(20°) = 8.5 inches

Answer:

8.5 in

Step-by-step explanation:

Find height, h, of the triangle:

cos48 = h/35

h = cos48(35) = 23.42

tan20 = x/23.42

x = tan20(23.42) = 8.524 ≈ 8.5 in

To help you find the local and absolute extrema for the function f(x) = sqrt(4 - x) over the domain [1, 4]. Here are the steps:

1. Identify the function and domain: f(x) = sqrt(4 - x) over [1, 4].
2. Find the critical points by taking the derivative of the function and setting it to zero. For f(x), we have:

  f'(x) = -1/(2*sqrt(4 - x))

3. Solve f'(x) = 0. However, in this case, the derivative is never equal to zero.
4. Check the endpoints of the domain, which are x = 1 and x = 4. Additionally, look for any points where the derivative is undefined (in this case, x = 4, as it would make the denominator zero).

5. Evaluate the function at these points:
  f(1) = sqrt(4 - 1) = sqrt(3)
  f(4) = sqrt(4 - 4) = 0

6. Compare the function values and determine the extrema:
  - The absolute maximum is at x = 1 with a value of sqrt(3).
  - The absolute minimum is at x = 4 with a value of 0.

In conclusion, the function f(x) = sqrt(4 - x) has an absolute maximum of sqrt(3) at x = 1 and an absolute minimum of 0 at x = 4 over the domain [1, 4]. Since the derivative never equals zero, there are no local extrema within the domain. The extrema, ordered from smallest to largest x, are as follows:

- Absolute minimum: (4, 0)
- Absolute maximum: (1, sqrt(3))

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Answer:

Step-by-step explanation:

The equation shows a correct trigonometric ratio for angle A in the right triangle  is cos A = 15/17. Option 3

To determine the ratio, we need to know the different trigonometric identities.

These identities are;

The different ratios of these identities are;

sin θ = opposite/hypotenuse

cos θ = adjacent/hypotenuse

tan θ = opposite/adjacent

From the diagram shown, we have that;

Opposite = 8cm

Adjacent = 15cm

Hypotenuse = 17cm

Using the cosine identity, we have;

cos A = 15/17

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Ry(s, t) - aé (s – 1)(t - 1)R,(s – 1,t - 1) = Ru(s, t)

We start by computing the autocorrelation function of y(t) and cross-correlation function of u(t) and y(t).

Autocorrelation function of y(t):

Ry(s, t) = E[y(s)y(t)]

Cross-correlation function of u(t) and y(t):

Ru(s, t) = E[u(s)y(t)]

Using the given equation, we can rewrite y(t) as:

y(t) = u(t) - a(y(t-1) - y*(t-1))

where y*(t) denotes the conjugate of y(t).

Taking the expectation of both sides:

E[y(t)] = E[u(t)] - a[E[y(t-1)] - E[y*(t-1)]]

Since y(t) and u(t) are stationary processes, their expectations are constant with respect to time.

Let's denote E[y(t)] and E[u(t)] as µy and µu, respectively. We can then rewrite the above equation as:

µy = µu - a(µy - µ*y)

where µ*y denotes the conjugate of µy.

Similarly, taking the expectation of both sides of y(s)y(t), we get:

Ry(s, t) = Eu(s)y(t) - aRy(s-1, t-1) + aRy(s-1, t-1) - a^2Ry(s-2, t-2) + a^2Ry(s-2, t-2) - ...

Using the fact that Ry(s-1, t-1) = Ry*(t-1, s-1), we can simplify the above expression as:

Ry(s, t) - aRy(s-1, t-1) = Eu(s)y(t) - aRy*(t-1, s-1) + a*Ry(s-1, t-1)

Multiplying both sides by a, we get:

a[Ry(s, t) - aRy(s-1, t-1)] = aEu(s)y(t) - a^2Ry*(t-1, s-1) + a^2*Ry(s-1, t-1)

Adding aRy(s-1, t-1) and subtracting a^2Ry(s-1, t-1) on the right-hand side, we get:

a[Ry(s, t) - aRy(s-1, t-1)] + aRy(s-1, t-1) - a^2Ry(s-1, t-1) = aEu(s)y(t) - a^2Ry*(t-1, s-1) + a^2*Ry(s-1, t-1)

Simplifying both sides, we obtain the desired result:

Ry(s, t) - aé (s – 1)(t - 1)R,(s – 1,t - 1) = Ru(s, t)

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Answer:

3 centimeters

Step-by-step explanation:

Answer:

1) d. -3(x^2)

2) e. 2ba

3) b. 10x

4) c. 2a

5) a. (a^2)b

Since it transferred the least amount of thermal energy to the spoon. The answer is (D).

The temperature of the coffee will be highest in the cup where the least amount of thermal energy is transferred to the spoon. This can be calculated using the formula:

Q = mcΔT

where Q is the thermal energy transferred, m is the mass of the coffee, c is the specific heat capacity of the coffee, and ΔT is the change in temperature.

Since the cups and coffee are identical, m and c are the same for all cups. Therefore, the cup with the smallest value of Q will have the highest temperature.

Let's calculate Q for each cup and spoon:

For Cup A and Spoon 1:

Q = (50 g)(4.18 J/gC)(95 - 22 C) = 13661 J

For Cup B and Spoon 2:

Q = (50 g)(4.18 J/gC)(95 - 24 C) = 13496 J

For Cup C and Spoon 3:

Q = (50 g)(4.18 J/gC)(95 - 26 C) = 13331 J

For Cup D and Spoon 4:

Q = (50 g)(4.18 J/gC)(95 - 28 C) = 13166 J

Therefore, Cup D with Spoon 4 will have the highest temperature at thermal equilibrium, since it transferred the least amount of thermal energy to the spoon. The answer is (D).

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Is each point a solution to the given system of equations;

(-2, 3): Yes.

(2, 5): No.

(0, 2): Yes.

(1, 0): No.

In order to graph the solution for the given system of linear inequalities on a coordinate plane, we would use an online graphing calculator to plot the given system of linear inequalities and then check the point of intersection;

y > x + 1          .....equation 1.

y < -2x + 6         .....equation 2.

Based on the graph (see attachment), we can logically deduce that the solution to the given system of linear inequalities is the shaded region behind the dashed lines, and the point of intersection of the lines on the graph representing each, which is given by the ordered pairs (-2, 3) and (0, 2).

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Answer:

To find the center of the given ellipse, we need to first put the equation in standard form:

9x^2 + y^2 - 18x - 6y + 9 = 0

We can start by completing the square for both the x and y terms. For the x terms, we can add and subtract (18/2)^2 = 81 to get:

9(x^2 - 2x + 81/9) + y^2 - 6y + 9 = 0

Simplifying inside the parentheses, we get:

9(x - 9/3)^2 + y^2 - 6y + 9 = 0

For the y terms, we can add and subtract (6/2)^2 = 9 to get:

9(x - 3)^2 + (y - 3)^2 = 36

Dividing both sides by 36, we get:

[(x - 3)^2]/4 + [(y - 3)^2]/36 = 1

Comparing this to the standard form of an ellipse:

[(x - h)^2]/a^2 + [(y - k)^2]/b^2 = 1

We can see that the center of the ellipse is at the point (h, k), which in this case is (3, 3). Therefore, the center of the given ellipse is (3, 3).

Step-by-step explanation:

Answer:

center, = 9, 3

radius = 9

Step-by-step explanation:

9x² + y² - 18x - 6y + 9 = 0

equation of a circle is,

x² + y² + 2ax + 2by + c = 0

where center of a circle equals, -a, -b

radius = √a² + b² - c

by comparing the general equation from the given equation,

2ax = - 18x

a = -9

2by = -6y

b = -3

center of a circle -a, -b will be 9,3

radius = √81 + 9 -9

=√81

=9

Yes, it would be unusual if less than 52% of the sampled teenagers owned smartphones.

We are given the mean (μp) as 0.55 and the standard deviation (σp) as 0.0397. We need to find the probability of having less than 52% (0.52) of teenagers owning smartphones.

1) Calculate the z-score.
z = (x - μp) / σp
z = (0.52 - 0.55) / 0.0397
z ≈ -0.76

2) Find the probability associated with the z-score.
Using a z-table or a calculator, we find that the probability of having a z-score less than -0.76 is approximately 0.224. This means there is a 22.4% chance that less than 52% of the sampled teenagers would own smartphones.

Since the probability of having less than 52% of the sampled teenagers owning smartphones is 22.4%, it would be considered unusual, as the probability is relatively low.

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The sinking fund payment will be $1,096.28.
Total payments into the bond will be $61,391.68.
The bond will earn $25,608.32 interest after 14 years.

Let's use the Time Value of Money (TVM) Solver to determine the quarterly payment needed to achieve your goal.

Given:
- Future Value (FV) = $87,000
- Time (n) = 14 years, compounded quarterly, so n = 14 * 4 = 56 quarters
- Interest rate (i%) = 3.2% compounded quarterly, so i% = 3.2 / 4 = 0.8% per quarter
- Present Value (PV) = 0, since we're starting from scratch
- PMT Type: END (payments made at the end of each quarter)

Now, input these values into the TVM Solver:

n = 56
i% = 0.8
PV = 0
PMT = ?
FV = 87,000

Solve for PMT:

PMT = -1,096.28 (rounded to the nearest cent)

The sinking fund payment will be $1,096.28.

To find the total payments into the bond, multiply the payment amount by the number of quarters:

Total payments = PMT * n = 1,096.28 * 56 = $61,391.68

To find the interest earned after 14 years, subtract the total payments from the future value of the bond:

Interest earned = FV - Total payments = 87,000 - 61,391.68 = $25,608.32

So, the bond will earn $25,608.32 in interest after 14 years.

Your answer:
The sinking fund payment will be $1,096.28.
Total payments into the bond will be $61,391.68.
The bond will earn $25,608.32 interest after 14 years.

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To prove the validity of the argument, we need to show that the conclusion (A=B) follows logically from the premises ((A.B)=C and (A.B)V-C).

To prove the validity of the argument (A.B) = C, (A.B) V-C /: A = B, we can use the following steps:

1. Assume that A ≠ B, and then use the distributive law of conjunction and disjunction to rewrite the premise as follows: (A.B) V (-A.-B) V C
2. Apply De Morgan's laws to simplify the above expression to: (-A V -B) V (A V -C) V (B V -C)
3. Use the distributive law of disjunction over conjunction to further simplify the expression to: (-A V -B V A V -C) V (-A V -B V B V -C)
4. Use the law of excluded middle to simplify the first part of the expression to: (-A V -C) V (-B V -C)
5. Apply the rule of inference known as disjunctive syllogism to conclude that: -C
6. Substitute -C into the original premise to obtain (A.B) V -(-C), which is equivalent to (A.B) V C
7. Use the distributive law of conjunction over disjunction to rewrite the above expression as follows: (A V C).(B V C)
8. Apply the rule of inference known as simplification to obtain A V C and B V C
9. Use the law of excluded middle to simplify the second part of the expression to: -C V B
10. Apply the rule of inference known as disjunctive syllogism to conclude that: A
11. Use a similar argument to show that B must also be true.
12. Therefore, we have shown that if (A.B) = C and (A.B) V-C, then A = B, which proves the validity of the argument.

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