This is correct? I need help please :(

well, we only no that

2l + 2w is 80

(lengths and widths on all 4 sides

and that w * l is A

so the function should be w times what's left for l, but also expressed by something with w

2l + 2w = 80 | -2w

2l = 80 -2w | devide by 2

l = 80 - w

now we can substitute l in

A = w * l

so that we only need w's

A(w) = w * (80-w)

for any w it will give us the area, makes only sense for 0<w<80

step-by-step explanation: the answer for wha if rt is 10 centimeters long, and wha is st? it’s 6

it would take 5 hours i think idk i'm not that good at math.can you me with my questions i need asap.