Mark wants to calculate the circumference of a circle with a radius of 7 centimeter. Which expression represents the circumference of the circle? 2 x 3.5 x π
2 x 14 x π
72 x π
14 x π

14 x π

Step-by-step explanation:

The circumference of a circle is 2πr

Here, r is 7.

2 x 7 x π

=> 14π

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: