Solve for L. P=2(l+w)

l = p - 2w/2

Step-by-step explanation:

P=2(l+w)

to solve for l is simply making l the subject of the formular

now

from p = 2(l +w)

we open the bracket

p = 2l + 2w

p- 2w = 2l

divide both sides by 2

p - 2w/ 2 = 2l/2

therefore

l = p - 2w/2 solved

your answer would be 10x - 1

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50