(6x2 - 4x + 11) + ( 4 - x2 – 3x)

5x^2-7x+15

Step-by-step explanation:

(6x^2 - 4x + 11) + ( 4 - x^2 – 3x)

Combine like terms

6x^2 - x^2   -4x -3x   +11+4

5x^2     -7x        +15

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

the diver is 33 feet below the surface.

step-by-step explanation:

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