Question

Brock is a plumber. He charges a flat rate of $40 to visit a house to inspect it's plumbing. He charges an additional $20 for every hour he spends inspecting or making repairs

Answer 1

C= 40 + 20h

Explanation:

Brock is a plumber.

His flat rate to visit house, b = $40

Additional charge rate , h = $20 per hour for inspecting and making repairs

Let he work for x hour.

Total charge by Brock for x hours, C

C = Fixed charge + Variable charge

C = 40 + 20h

where, h is number hours and C is total changes.

Hence, The equation which shows total charge is C= 40 + 20h

Answer 2

Based on the given data we could derive an equation that will express the statement as, Income (i) = 20h + 40. That was express that way since it says that thre is already a 40 dollars charge for inspection, so it is a constant variable. Then it will be added to the product of number of hours times 20 dollars per hour.