Answer: the first mechanic charged $105 per hour and the second mechanic charged $95 per hour.
Step-by-step explanation:
Let x represent the the rate charged per hour by the first mechanic.
Let y represent the the rate charged per hour by the second mechanic.
The first mechanic worked for 10 hours, and the second mechanic worked for 5 hours. Together they charged a total of $1525. This means that
10x + 5y = 1525- - - - - - - - -1
if the sum of the two rates was $200 per hour, it means that
x + y = 200
Substituting x = 200 - y into equation 1, it becomes
10(200 - y) + 5y = 1525
2000 - 10y + 5y = 1525
- 10y + 5y = 1525 - 2000
- 5y = - 475
y = - 475/ - 5
y = 95
x = 200 - y = 200 - 95
x = 105
(4x^2+3) + (3x^2+8) = 7x^2+11
Answer:739,000
Step-by-step explanation:
Answer:
Step-by-step explanation:
The answer is $11.55 for the week.
1) Since 1 watt is 0.001 kilowatts, 1500 watts is 1.5 kilowatts.
2) Multiply that by 7 for the week and that equals 10.5.
3) It takes her 10 minutes each day, so it takes 70 minutes per week, that is also 1.1 hours.
4) Multiply 10.5 kilowatts by 1.1 hours and you get 11.55.
5) The answer is $11.55 per week to dry Lisa's hair.
Answer:
y=2x^2−5x+18
Step-by-step explanation: