Answer:
Please see the attached picture ! :D
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Cost = fix cost + hourly cost - discount
Cost = 4* [5 + 4x - 4x(20/100)] = 4*[5 + 4x - 0.8x] = 4*[5 + 3.2x] = 20 + 12.8x
Answer: option B) 12.8x + 20
U basically solve: (4sqrt8)*2 + (5 sqrt 12 + 6 sqrt 20)*2
Answer:
Image B shows a reflection.
C would be the answer. When you simplify the equations C does not contain a radical.