Lily needed to get her computer fixed. She took it to the repair store. The technician at the store worked on the computer for 3
.5 hours and charged her $159 for parts. The total was $456.50. Write and solve an equation which can be used to determine x x, the cost of the labor per hour.
Reason 456.50 is the total 159 is for the parts 3.5 is the number of hours
So to find the cost you have to find out how much it cost for the labor by subtracting the total cost from the cost of the parts. To find the cost of labor for each hour you have to divide the total cost of labor by the number of hours used to work on the computer
F ( x ) = ( x + 7 ) ( x + 4 ) - ( x + 5 ) ( x + 2 ) = = ( x² + 4 x + 7 x + 28 ) - ( x² + 2 x + 5 x + 10 ) = = ( x² + 11 x + 28 ) - ( x² + 7 x + 10 ) = = x² + 11 x + 28 - x² - 7 x - 10 = 4 x + 18 Answer: The area of the shaded region is 4 x + 18.
