Question

Anyone can help me with it??

Answer 1

set up equations
x+w=20
A= 2x^2+w
or A= 2x^2 -x +20

Answer 2

find the min of the parabola

Answer 3

\[f(x)=(2x)(20)-(2x-1)(20-x),\]\[f'(x)=4x-1\implies4x-1=0\implies x=\frac{1}{4}.\]I am not sure if this is correct, though.

Answer 4

thanks :]