<u>Answer-</u>

<u>Solution-</u>
Given the two polynomials are 
So their product will be,

Distributing the Parentheses,

Applying minus-plus rules,

Simplifying further,

<span>t=(512/216)^(1/2)
t=((8)(3)^(1/2))/9
t is about 1.539600718 hours
I don't believe the storm will be twice as long because the number multiplied by itself three times will give a much, much higher number than what was your original diameter.</span>
14% * 3.09 million = 432,600
As given,
"tangent line to f(x) is tangent at (7,5)", therefore f(7)=5.
Line is tangent at (7,5) and passes through (0,4), therefore the slope of the line is the slope of f(x=7) = f'(7).