Acar repair shop charged $80 per hour for labor and $210 for the parts of a car. if the total cost of repair for the car was $490, how many hours did it take to repair the car? 1) 0.59 2) 2.71 3) 3.50 4) 8.75

Let h = number of hours.

The shop charges $80 per hour, so for h hours of labor you pay 80h.

The parts were $210, so the parts and labor charges combined are

80h + 210

That equals $490, so we get this equation.

80h + 210 = 490

80h = 280

h = 3.5

3) 3.5

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square