Answer: C. 

Step-by-step explanation:
If 't' represents the number of hours Joanne tutors and 'r' represents the number of hours she works as a receptionist.
Then the total hours she can work=t+r
Since she can work up to 25 hours.
Thus 
If she earns $25 per hour by tuition and $ 12 per hour by working as a receptionist .
Then her total earning =$
Since she must earn $200.
Then
.
Therefore, the required system of inequality will be


Answer:
120 out of 400 does not equal 20%
it equals 30%
Step-by-step explanation:
To get days from minutes, you should get to hours because the calculations are ten times easier. To find the amount of hours 8640 minutes is, divide 8640 by 60. 8640/60 = 144. 8640 minutes is 144 hours, and 144 divided by 24 is 6 days. There are 6 days in 8640 minutes.
Answer: 3 quart
Step-by-step explanation:
Given
Jason poured 1 gallon 1 quart of water into an empty 2 gallon bucket
1 gallon can be written as 4 quart
So, 2 gallon can be written as 8 quart
Subtract 1 gallon 1 quart(5 quart) from 2 gallon(8 quart) to get the volume added

So, 3 quart of water must be added to reach 2 gallon capacity.