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4 years ago

PLEASE, NEED HELP!

1 answer:

8 0

<span>Which shows the elements of the set of whole number multiples of four less than 21?

The multiples of 4 are 4, 8, 12, 16, 20, 24, 28,...

Then, the set of the multiples of four less than 21 is {4, 8, 12, 16, 20}

A: {1, 2, 3, 4, 5}
B: {4, 8, 12, 16, 20}
C: all real numbers
D: null set

Which shows the set(s) the number 2.77 is an element of?

2.77 is a real number, it is not a natural number, and it is not a whole number.

A: real numbers

B: real numbers and natural numbers

C: natural numbers and whole numbers

D: null set

Given sets:

D = {5, 6, 7, 8, 9, 10}, E = {1, 3, 5, 7, 9, 11}, F = {3, 6, 9, 12}

What is D n E?

I believe the question is what is D ∩ E, which is the elements that are as much in D as in E. This is {5,7,9}

A: {1, 3, 5, 6, 7, 8, 9, 10, 11}

B: {5, 7, 9}

C: {9}

D: null set</span>

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In a mathematic test 30 students obtained the following scores

Aleks [24]

Answer:

a) Prepare a frequency table for the data

Step-by-step explanation:

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2 years ago

I WILL GIVE MORE POINTS IF I GET THE RIGHT ANSWER

shutvik [7]

Answer:

v= 6km/h - 1km/h^2 * t

Step-by-step explanation:

From the information, it seems the runner is slowing down because the speed at 1st hour is 5km/h but at 3rd hour becomes 3km/h.

If v= velocity, v0= initial speed, t= time, and the a=acceleration then the function would be:

v= v0 + a * t

To find the acceleration you need to do this equation:

acceleration= velocity1- velocity3 / t3-t1

a = (3km/h-5km/h)/ (3 hour- 1 hour)

a = (-2km/h)/2hour= -1 km/hour^2

After that, you need to find the initial speed. Try to put the 1st-hour variable into the full equation. It would look like this

v= v0 + a * t

5km/h= v0 + (-1 km/hour^2 * 1 hour)

v0= 5km/h + 1km/h

v0= 6km/h

Then the full function would be:

v= 6km/h - 1km/h^2 * t

The graph would look like a backslash(\) from 5 gradually go down to 1.

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7 0

3 years ago

You have 50 rolls of fencing that are each 15 1/2 feet long. What is the total length of fencing

Lelu [443]

Don't you divide 50 by 15 and 1/2

3 0

3 years ago

Read 2 more answers

What is the slope of the line that contains the points -4,2 and 6,3

ExtremeBDS [4]

Answer:

1/10

Step-by-step explanation:

slope of a line is m

m=y2-y1/x2-x1 = 3-2/6-(-4)= 1/10

7 0

3 years ago

We need a rock garden with a perimeter of 12 feet and an area of 8 square feet what is the length and width

Katarina [22]

The dimensions of the rectangle can be a length of 2ft and a width of 4ft.

<h3>How to find the dimensions of the garden?</h3>

Remember that for a rectangle of length L and width W, the perimeter is:

P = 2*(L + W)

And the area is:

A = L*W

In this case, we know that the area is 8 square feet and the perimeter is 12 ft, then we have a system of equations:

12ft = 2*(L + W)

8ft² = L*W

To solve this, we first need to isolate one of the variables in one of the equations, I will isolate L on the first one:

12ft/2 = L + W

6ft - W = L

Now we can replace that in the other equation to get:

8ft² = (6ft - W)*W

This is a quadratic equation:

-W^2 + 6ft*W - 8ft² = 0

The solutions are given by Bhaskara's formula:

$W = \frac{-6 \pm \sqrt{(6ft)^2 - 4*(-1)*(-8)} }{2*-1} \\\\W = \frac{-6 \pm 2}{-2}$

Then we have two solutions:

W = (-6 - 2)/-2 = 4ft

W = (-6 + 2)/-2 = 2ft

If we take any of these solutions, the length will be equal to the other solution.

So the dimensions of the rectangle can be a length of 2ft and a width of 4ft.

if you want to learn more about rectangles:

brainly.com/question/17297081

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4 0

3 years ago