Guy is pouring a new patio for his house. he rents a concrete mixer for $50 per day plus $12.50 per hour. if he is charged $143.75, how long did guys have the concrete mixer?

Guy rented the concrete mixer for 7.5 hours

Solution:

Guy is pouring a new patio for his house

He rents a concrete mixer for $50 per day plus $12.50 per hour

Let "x" be the number of hours mixer is rented for

He is charged $143.75

Total charge = $ 143.75

From the given information, we frame a equation as,

Total charge = $ 50 per day + $ 12.50 per hour

143.75 = 50 + 12.50(number of hours)

143.75 = 50 + 12.50x

Solve the equation for "x"

12.50x = 143.75 - 50

12.5x = 93.75

x = 7.5

Thus he rented the concrete mixer for 7.5 hours

the answer is  

a.

28 ft2

step-by-step explanation: