Find the volume of a sphere with a radius of 5 ft.
A) 631.58 ft B) 288.35 ft
C) 690.22 ft D) 523.6 ft?

D) 523.6 ft

Step-by-step explanation:

Use the equation for volume of a sphere

Plug in 5 for the radius

V = 523.6 ft

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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: