You are planning a movie stunt using an aircraft that moves vertically at a constant rate of -55 feet per second. You want the stunt to last 15 seconds and to end when the
aircraft is only 30 feet above the ground. At what altitude should the stunt begin?

10

step-by-step explanation:

7+3=10

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

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