A tree is 4 1/2 feet tall it is expected to grow by 1 3/4 feet per year. At this growth rate, how many years will it take fo the tree to have a height greater than 40 feet?

21 years

That was pretty easy, I doubt you're in highschool but yea :)

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

step-by-step explanation: