Answer:
h=6
Step-by-step explanation:
since 
is an equation for a line which intersects with the curve 
. The point of intersection, let's say 
, should satisfy the two equations. As a result, the value of y in the second equation can be replaced with the value of y in the first equation as the following,
therefore, the latter equation can be rewritten in a quadratic equation form as the following,
= 0
if the line is tangent to the curve, it means that the line touches the curve at one point, therefore the discernment of the second order equation will be equal to zero for the famous quadratic equation solution.
where 
and 
, as a result, the following equations can be deduced,
therefore, dividing both sides by 12
56 is your answer.
Equation for direct proportion is y = kx where k is the constant of proportionality. For your letters, it’s f = ka
We know 72 =k9, so k = 8
Then they want you to solve
f = 8•7
f = 56
The answer is e because the volume is 54 pi mm^3. This is because the volume of a cylinder is pi * r^2 * h.
