I think it’s 1384939384$3
Width = w
length = w+2
f(w) =w(w+2) = w^2 + 2w.
Please, let me know whether the procedure is clear for you.
The answer is f(w)=w^2 + 2w.
Answer:
2)

collect like terms

move the constant to the right hand side and change its sign.

Subtract the numbers

Divide both sides of the equation by 8

Just add that’s by 6 then times it by 5 the add 3 to it
The answer is: 12.8
71 -7 = 64
64÷5=12.8