Ubtract -2k3 + k2 - 9 from 5k3 - 3k + 7.

Step-by-step explanation:

1. You have the following expression:

2. Distributive the negative sign that is in front of the parentheses:

3. Now, you must add like terms, then you obtain the following result:

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: