Please help me with this

A: 5x^2 + 42x + 16

B: 12x + 20

C: 351 units

Step-by-step explanation:

A: (5x + 2) * (x + 8) is the same as x(5x + 2) + 8(5x + 2). You just need to solve and simplify that for the area:

x(5x + 2) + 8(5x + 2)

= 5x^2 + 2x + 40x + 16

= 5x^2 + 42x + 16

B: You need to do 2l + 2w, or 2(5x + 2) + 2(x + 8):

2(5x + 2) + 2(x + 8)

= 10x + 4 + 2x + 16

= 12x + 20

C: You can either replace the x in the equation with 5 or replace the x in the figure itself with 5. I will replace the one in the figure with 5 because it is a lot easier:

(5(5) + 2) * (5 + 8)

= 27 x 13

= 351 units

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step-by-step explanation:

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