Answer:
b. 
f. 17 hours
Step-by-step explanation:
Charges for coming to my house = $68 (this will be the constant of the equation)
Amount charged per hour labor = $17
hours = h
Total amount paid to Mike = 357
The equation that represents this situation can be expressed as:

Solve for h
(subtraction property of equality)

(division property of equality)

Mike was in my house for 17 hours.
The number before the decimal and the first number after the decimal and the last number
This is an Acute Isosceles Triangle. Hope this helps :)
The common denominator is 12
7.5% of 160.
12 / 160 = 0.075
Move decimal 2 places to the left to convert it to a percent, or multiple by 100.
0.075 * 100 = 7.5
7.5% is your answer.