Evaluate: ab when a = 2 and b=4

8

Step-by-step explanation:

ab = 2 * 4 = 8

8

Step-by-step explanation:

ab when a = 2 and b = 4

First, plug in the values into the expression.

ab = (a)(b)

(2)(4)

When two numbers are set next to each other in parentheses, you are multiplying them.

2 × 4 = 8

Therefore, ab = 8

Hope this helps!

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