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luda_lava [24]
3 years ago
15

7k÷3=21. What is the value of k?

Mathematics
2 answers:
andrew11 [14]3 years ago
7 0
<span>7k÷3=21

Explanation: 
You have to multiply 3 by 21

so you have </span><span>7k=63
</span><span>
k = 9</span>
viva [34]3 years ago
5 0
7k/3 = 21
x 3       x3
7k = 63
/7      /7
k = 9
(7(9)/3 = 21    =    63/3 = 21    =    21 = 21)
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Which table best represents the steps to solve the equation 8 + = 4?
aleksklad [387]
Usaully if you add a larger number with a smaller negative number you will get your answer is 8 + -4+4
5 0
3 years ago
A dolphin jumps from the water at an initial velocity of 16 feet per second. The equation h + -16t^2 + 80t models the dolphin's
Dominik [7]

Answer:

100feet

Step-by-step explanation:

Given the height reached by a dolphin expressed by the equation is h = -16t^2 + 80t. At maximum height, the velocity is zero, hence;

v(t) = dh/dt = -32t + 80

0 = -32t + 80

32t = 80

t = 80/32

t = 2.5secs

Substitute t = 2.5 into the height formula h = -16t^2 + 80t

h = -16(2.5)^2 + 80(2.5)

h = -100+200

h = 100feet

Hence  the maximum height the dolphin jumps is 100feet

3 0
2 years ago
6 feet<br> 12 feet<br> What is the area of the given composite shape?
Reika [66]

Answer:

choice A; 128.52 square feet

Step-by-step explanation:

This shape is made up of a semi-circle and a rectangle. The area of the rectangle will be 12*6 = 72 sq ft.

The formula for area of a circle is \pi*r^{2}. also r=radius. We are given the diameter, 12 feet. The radius is diameter/2, so the radius of the circle will be 6 feet.

Since pi is infinite we round it to 3.14.

Plug in the values and our expression will be (3.14*6^{2})/2 because it is a semi-circle. Simplify that to (3.14*36)/2 = 113.04/2 = 56.52 sq ft.

Remember to add the area of the rectangle and semi-circle. 72 + 56.52 = 128.52 sq ft.

3 0
2 years ago
The length of RT is 4x-4.Given that point S is between point R and T,
Monica [59]

Answer:

RS = 32

Step-by-step explanation:

Set-up equation like this -- 2x+6+16=4x-4

Solve for x

Then plug x in for the length of RS. You should get 32 for RS.

7 0
3 years ago
Can yall help me with this?<br> Thank you!
Ray Of Light [21]

Answer:

<u>1260 degrees (1260°)</u>

Step-by-step explanation:

<u>Formula to Find Sum of Interior Angles of a Polygon</u>

  • 180 (n - 2)
  • n is the <u>number of sides</u> of the polygon

<u>Nonagon (9-sided polygon)</u>

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  • 180 × 7
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4 0
2 years ago
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