Answer:
C
Step-by-step explanation:
10•8=80
so something times 80 will equal 400
80•5=400
This is a linear equation in x.
So you need to group like terms

Let us group the x terms on the Right Hand Side of the equation and the constant terms on the Left Hand Side.

We can now simplify

Now let us divide both sides by 3.

This implies that

or

Let us our answer



Good we are right
It is given in the question that the solid is a cone with height of 16 units and radius of 7 units .
The formula of volume of cone is

To find the volume, we substitute the given values of r and h and use 3.14 for pi. That is

And that's the required volume of the cone .