how many 10-element subsets of {1, 2, 3, . . . , 20} contain at least one odd element? (hint: we are selecting a subset of the previous set, so {1,2,3,4,5,6,7,8,9,10} is the same as {1,2,3,5,4,6,7,8,9,10}.)

The true statements are:

A. KL=15

B. JL bisects IK

D. JL is the perpendicular bisector of IK

Two geometric objects are perpendicular in simple geometry if they intersect at a right angle. The perpendicular sign, ⊥ , can be used to visually depict the state of perpendicularity. It can be defined between two planes, two lines, or two planes and another line.

Given:

We have a triangle IJK.

m∠IJL=0.5 m∠JIK.

Side IJ ≅ side JK.

JL ⊥ IK.

It bisects the base.

That means,

JL bisects IK and JL is the perpendicular bisector of IK.

So, IL = LK.

3x = 2x + 5

x = 5

KL=15.

Therefore, A, B and D are the true statements.

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From the given example we can say that , the given expression is in the form of quotient of a powers property.

What is Algebraic expression ?

Algebraic expression can be defined as the combination of variables and constants.

Given expression,

3^9 / 3^4

= 3^(9-4)

= 3^(5)

So,

if a^m / a^n = a^(m-n)

Its in the form of quotient of powers property.

And from above we can say that, The given expression also in the form of quotient of powers property.

Hence, From the given example we can say that , the given expression is in the form of quotient of a powers property.

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The probability that the number of first graders who have liked the hot dog is 15

In math the term probability is defined as a number that reflects the chance or likelihood that a particular event will occur

Here we have know that in a survey of 50 first graders, and then 30% said their favorite food is hot dog.

Here we have to find the probability that the number of first graders who have liked the hot dog

As we know that the number of first graders is 50.

And here we also know that 30% of them are liked the hot dog.

Then it can be calculated as,

=> 50 x 30%

=> 50 x 30/100

=> 15.

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All of the expressions 2n8, 5n10, 2n3, n2, and 4n-14 are even for all values of n because all of the coefficients of n are even numbers.

2n8, 5n10, n2, 4n-14

2n8 : This expression is even for all values of n because the coefficient of n is an even number (2).

5n10 : This expression is even for all values of n because the coefficient of n is an even number (5).

2n3 : This expression is even for all values of n because the coefficient of n is an even number (2).

n2 : This expression is even for all values of n because the coefficient of n is an even number (1).

4n-14 : This expression is even for all values of n because the coefficient of n is an even number (4).

All of the expressions 2n8, 5n10, 2n3, n2, and 4n-14 are even for all values of n because all of the coefficients of n are even numbers.

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According to the elimination method, the solution of the system of equation has infinite number of solutions.

In math the term elimination method is the process of eliminating one of the variables in the system of linear equations using the addition or subtraction methods in conjunction with multiplication or division of coefficients of the variables

Here we know that the equations are

=> 6x - 2y = 8 ---------------(1)

=> -3x + y = -4 ------------------(2)

when we simplify the equation (1) by dividing the terms by 2, then we get

=> 3x - y = 4

Now, we have to add the two equation then we get the result as,

=> (-3x + 3x) +( -y + y) = (-4 + 4)

=> 0 + 0 = 0

Hence the system has an infinite number of solutions.

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19N force act in upward direction with angle of elevation 28 degrees has horizontal and vertical force is given by 16.78N and 8.92N respectively.

Angle of elevation while thrown a ball upward 'α' = 28 degrees

Force 'F' is equal to 19N.

While throwing a ball force is applied in two possible direction are:

Horizontal direction and Vertical direction.

For horizontal direction :

let 'x' represents the horizontal direction

cosα = x / F

⇒ cos28° = x / 19

⇒ x = 19 cos 28°

⇒ x = 19 × 0.8829

⇒ x = 16.78N

For Vertical direction :

let 'y' represents the vertical direction

sinα = x / F

⇒ sin28° = y / 19

⇒ y = 19 sin 28°

⇒y = 19 × 0.4695

⇒ y = 8.92N

Therefore, the horizontal force and vertical force for the given angle of elevation is equal to 16.78N and 8.92N respectively.

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The width of the arch at floor level is 18 inches.

Substitute x = 0 into the equation.
y = -1/9(0+18)(0-18)

Solve for y.
y = -1/9(-18)(18)
y = 18

Therefore, the width of the arch at floor level is 18 inches.

A linear system can be algebraically solved using the substitution approach. One y-value is substituted for another in the substitution procedure. Finding the value of the x-variable in terms of the y-variable is the method's most straightforward step.

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Answer:

See Below

Step-by-step explanation:

5. [tex]3.1 + (8.6 + m)\\3.1 + 8.6 + m\\11.7 + m[/tex]

take expression out of brackets by distribution (multiplying both by 1), then add

6. [tex]((\frac{2}{3})(t)) (1\frac{1}{2})\\(\frac{2}{3}t) (1\frac{1}{2})\\(\frac{2}{3}t) (\frac{3}{2})\\\frac{6}{6} t\\t[/tex]

Simplify the expression in the brackets by multiplying them together, once done turn the mixed fraction back into improper fraction in order to multiply the two together. Once done, simplify the expression

7. [tex]4(x + 8)\\4x + 32[/tex]

I would argue that factored form is the most simplified but regardless using the distribution rule you multiply both numbers within the bracket in order to get rid of it

8. [tex]4t + 7 + 2t - 2\\6t + 5[/tex]

This is just combining like terms and simplifying

Chris owes $35 in interest to the back next month.

We know that a credit card's interest rate is nothing but the price one  pay for borrowing money. This is called the annual percentage rate (APR).

The Interest paid is calculated by the formula:

I = PTR ÷ 100

where P = Principal amount ,

R= rate of interest in percentage ,

and T= period.

Here, P = $2800,

R = 15%

T=  1 year

Using above formula,

I = (2800 x 15 x 1) ÷ 100

I = 420.

He will pay an interest of 420 ÷ 12= $35 per month.

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From the set of numbers 9, 16, 25, 43 , the number does not belong to the group is prime number 43.

Set of numbers are 9, 16 , 25, 43.

9 is the composite number with 1, 3, 9 as factor.

It is perfect square of 3 also.

16 is the composite number with 1, 2, 4, 8,16 as factors.

It is perfect square of 4 also.

25 is the composite number with 1, 5, 25 as factors.

It is perfect square of 5 also.

43 is not a composite number.

It has only two factors 1, 43.

43 is a prime number.

It is not a perfect square of any number.

Here 43 does not belong to the group.

Therefore, the number which does not belong to the group from 9,16, 25, 43 is 43.

The above question is incomplete, the complete question is :

Which number does not belongs to group ?

9, 16, 25, 43.

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The sum of the given expression will be 2a+7b+-d.

What are expressions?

Expressions in math are mathematical statements that have a minimum of two terms containing numbers or variables, or both, connected by an operator in between. The mathematical operators can be of addition, subtraction, multiplication, or division. For example, x + y is an expression, where x and y are terms having an addition operator in between. In math, there are two types of expressions, numerical expressions - that contain only numbers; and algebraic expressions- that contain both numbers and variables.

e.g. A number is 6 more than half the other number, and the other number is x. This statement is written as x/2 + 6 in a mathematical expression. Mathematical expressions are used to solve complicated puzzles.

Now

Given expressions are 1.5b-2c+3-d 2.a+2b-c+d 3.2-d+3c+a

By adding these

=a+a+5b+2b-2c-c+3c-d+d-d

=2a+7b-d

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Answer: To find the price of the car in May, we can use the formula:

New price = Original price - (Original price x Discount rate)

In this case, the original price is $22,800, and the discount rate is 5%, which can be written as 0.05.

So, the new price in May is:

New price = 22700 - (22700 x 0.05)

New price = 22700 - 1135

New price = $21,565

So, the price of the car in May was $21,565.

To find the percentage of the price of the car in May as compared to the price of the car in April, we can use the formula:

(New price / Original price) x 100

In this case, the new price is $21,565 and the original price is $22,800

(21565 / 22700) x 100 = 0.95 x 100 = 95%

Therefore, in May, the price of the car was 95% as compared to the price of the car in April.

Step-by-step explanation:

Answer:

(i) Let's call Jaren's current age J. According to the problem, the sum of J and Daniel's age is 40.

If we also know that four years ago, Daniel was 3 times Jaren's age, we can set up the following equation:

J + (J+4) = 40

Solving for J, we find that Jaren's present age is 18.

(ii) When Jaren was born, Daniel would have been 18 + 4 = 22 years old.

the slope of A'B' is=  1.2 ,The length of A'C'  in triangle is =  3q unit.

When we dilate a triangle and the center of the dilation is at the center of the triangle, the only thing that changes are the coordinates of the summits of the triangle.

The angles remain the same, so do the slope.

So, since the slope of AB is equal to -1.2, the slope of A'B' will also be -1.2.

They say the dilation factor was 3, that means the length of every side was multiplied by 3.  So, if the length of AC is q units, the length of A'C' is 3q units.

The complete question is-

ΔABC is dilated by a scale factor of 3 with the origin as the center of dilation to form ΔA′B′C′. The slope of AB is -1.2. The length of AB is p units, the length of AC is q units, and the length of BC is r units.

The slope of AB is (?). The length of is (?) units.

the slope of AB is?

A. 1.2 B. -1.2 C. -3.6

The length of AC is ?

A. 1/3q

B. 3q

C.-1.2p

D. (p+q+r)

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Lisa and Joe put $46 towards the gift

Let's call the amount of money that Sara put in "x".

Joe put in twice that amount, so he put in 2x.

Lisa put in ten dollars more than Sara, so she put in x + 10.

Together, Sara, Joe, and Lisa put in x + 2x + (x + 10) = $58.

Evaluate the like terms, so we have

4x + 10 = 58.

Subtracting 10 from both sides, we get

4x = 48.

Dividing both sides by 4, we find that

x = $12.

So Sara put in $12, Joe put in $24, and Lisa put in $22.

The total amount put by Lisa and Joe is  $24 + $22 = $46.

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Complete question

Three friends are put their money together to buy a $58 gift. Joe put in twice the amount of money as Sara. Lisa put in ten dollars more than Sara. How much money did Lisa and Joe put towards the gift?

Answer:

0.82

Step-by-step explanation:

A： area =2( 0.8*0.6*+0.6*1+0.8*1) =2(0.48+0.6+0.8)=2*1.88 =3.76

B：area = 2(1.4*0.5+0.5*1.2+1.4+1.2) =2(0.7+0.6+1.68)=2*2.98=5.96

total 9.72

cost = $6.79* 9.72/80 =$0.82

Answer:

0.92

Step-by-step explanation:

Answer:

14S -93

Step-by-step explanation:

(4s+7 -2S) +4 (3s-5^2)

= 2S +7 +12S -4*25

=14S -93

Answer:

  D.  0.391

Step-by-step explanation:

You want the approximate solution to f(x) = x² -3x +1 = 0 on the interval [0, 1] using 5 iterations of the Bisection Method.

The Bisection Method makes one iteration by finding the function value at the midpoint of the interval. The midpoint replaces the end of the interval whose function value has the same sign. At the end of one iteration, the midpoint of the halved interval is calculated.

Start:

  f(0) = 1, f(1) = -1. Interval: [0, 1]; midpoint: 1/2

First iteration:

  f(1/2) < 0. Interval: [0, 1/2]; midpoint: 1/4

Second iteration:

  f(1/4) > 0. Interval: [1/4, 1/2]; midpoint: 3/8

Third iteration:

  f(3/8) > 0. Interval: [3/8, 1/2]; midpoint: 7/16

Fourth iteration:

  f(7/16) < 0. Interval: [3/8, 7/16]; midpoint: 13/32

Fifth iteration:

  f(13/32) < 0. Interval: [3/8, 13/32]; midpoint: 25/64

The approximate solution after 5 iterations is x ≈ 25/64 ≈ 0.391.

__

Additional comments

The approximate solution in the interval to full calculator precision is 0.38196601125. The exact solution is 1.5-√1.25.

You will notice that the function values for the ends of the interval [0, 1] are [positive, negative]. So, when the function value at the midpoint is negative, that point replaces the right end of the interval.

Of course, the midpoint is the average of the interval end values.

On average, it takes about 3.3 iterations to improve the accuracy of the solution by 1 decimal place.

The total number of four-digit parity-monotonic integers is 432*1 = 24.

We can solve this problem by counting the number of parity-monotonic integers in each of the four digits individually and then multiplying the counts together.

By counting the possible values of [tex]$a_1$[/tex], [tex]$a_2$[/tex], [tex]$a_3$[/tex] and [tex]$a_4$[/tex] independently, we have:

Thus, the total number of four-digit parity-monotonic integers is 432*1 = 24.

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Answer:

(n - 3/5)²

Step-by-step explanation:

(n - 3/5)²

A: The exponential function for the situation is P(t) = 36,000 × (1 + 0.15)^t.

B: The population in 2020 was 72,396.

What is an exponential function?

The formula for an exponential function is f(x) = a^x, where x is a variable and a is a constant that serves as the function's base and must be bigger than 0.

The population of a city in 2015 is 36,000 and it is increasing at 15% per year.

Model this using an exponential equation of the form -

P(t) = P0 × (1 + r)^t

Where -

P(t) is the population after t years

P0 is the initial population in 2015 (36,000)

r is the rate of growth (0.15)

t is the number of years since 2015

So the exponential equation that models the population is -

P(t) = 36,000 × (1 + 0.15)^t

Part B:

To find the population in 2020, substitute t = 5 (2020 - 2015) into the equation -

P(5) = 36,000 × (1 + 0.15)^5

P(5) = 36,000 × 1.15^5

P(5) = 36,000 × 2.011

P(5) = 72396

Calculating this gives us a population of approximately 72,396 in 2020.

To obtain this answer, the exponential equation that models the population, P(t), is used where t represents the number of years since 2015, with the given information that population in 2015 was 36,000 and it's increasing at 15% per year and substitute the value of 5 for t.

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Answer:

6 Tables

Step-by-step explanation:

48 tables divided by 8 paintbrushes equals 6 tables.

The result of a histogram of the given data is 0.8.

There are a few steps to use a TI-83, TI-83 plus, or TI-84 calculator is used to create the histogram.

1. First, the process is to press the STAT key and then press ENTER.

2. Enter the data into column L1.

3. In the third step with all of the data entered, press the 2nd key and then press the Y= key to open the STAT PLOT menu.

4. After that press ENTER and make sure that Plot1 is set to On.

5. Use the directional keys to navigate to the Type selector, move the selection to the third type in the top row, and press ENTER.

6. Make sure that Xlist is set to L1 as this needs to be the same column as the list that the data were entered into previously. If it is not, highlight the value for Xlist and press 2nd and the 1 key for list L1.

7. Finally, press the ZOOM key and then press 9 in order to change the zoom to ZoomStat. When this is finished, the correct histogram will display on the calculator.

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Coordinates of the vertices of the octagon after dilation by scale factor 3 are (-12, 6), (-6,15), (3,15), (9, 6), (9, -18), (3, -9), (-6, -9),and (12, -18).

Original coordinates of the vertices of an octagon are :

(-4, 2), (-2,5), (1,5), (3, 2), (3, -6), (1, -3), (-2, -3), and (4, -6).

Scale factor is equal to 3

Figure transformed using dilation of scale factor of 3 with center of dilation at the origin.

Coordinates of the new vertices after dilation of the octagon.

(-4×3, 2×3) = ( -12, 6)

(-2 ×3,5×3) = ( -6 , 15)

(1 ×3,5×3) = ( 3 ,15)

(3×3, 2×3) = ( 9,6)

(3×3, -6×3) = ( 9, -18)

(1 ×3, -3×3) = ( 3 , -9)

(-2×3, -3×3) = ( -6 , -9)

(4×3, -6×3) = (12, -18)

Therefore, the new coordinates of the vertices after dilation are (-12, 6), (-6,15), (3,15), (9, 6), (9, -18), (3, -9), (-6, -9),and (12, -18).

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A certain corner of a room is selected as the origin of a rectangular coordinate system. A fly has coordinate (1.7, 0.6). The distance of the fly from the corner of the room is 1.8 meters.

Suppose we have a point having coordinate (x,y). Then the horizontal axes, vertical axis,  and the distance from the origin form a right triangle which its base is x and y.

Hence, we can find the distance of the point (x,y) from the origin using the Pythagorean Theorem.

In this case, the origin is a certain corner of the room. The coordinate of the fly is (1.7, 0.6) meters.

Using the Pythagorean Theorem:

distance = sqrt (1.7² + 0.6²)

distance = sqrt (2.89 + 0.36)

distance = sqrt (3.25)

distance = 1.8 meters

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The difference between the water levels for the high and low tide was 3. 6 feet. the equation to find the water level at high tide x = y + 3.6, where  High Tide Water Level = x and  Low Tide Water Level = y.

In simple form it will be  High Tide Water Level = Low Tide Water Level + 3.6. To explain this equation, the water level at high tide is equal to the water level at low tide plus 3.6 feet. The variable 'x' represents the water level at high tide, while the variable 'y' represents the water level at low tide. By adding 3.6 feet to the water level at low tide, we can find the water level at high tide.  

For example, if the water level at low tide is 4 feet, the water level at high tide would be 4 + 3.6 = 7.6 feet. To find the water level at high tide for any given low tide water level, one can simply add 3.6 feet to the known low tide water level. This equation can be used to accurately calculate the water level at high tide for any given low tide water level.

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Lela had the highest score.

Now, According to the question:

A skewed distribution is neither symmetric nor normal because the data values trail off more sharply on one side than on the other. In business, you often find skewness in data sets that represent sizes using positive numbers.

In a negatively skewed distribution, higher values are more frequent than lower values causing the distribution to present a longer left-tail. This implies in a median higher than the mean and in a mode higher than the median:

mean < median < mode.

Therefore, since Lela scored at the mode, Lela had the highest score.

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Answer:

iam sorry

i don't know the answer