Answer:
156 square m
Step-by-step explanation:

Answer:
70 is answer
Step-by-step explanation:
Given that a function in x is

we have to find f'(7)
we know by derivative rule derivative of a function is

For finding out at 7 we replace x by 7

=
So f'(7) = 70
answer is 70
True. just like Texaschic101 said DV= M