1gal3 qt+2qt3pt i don’t know how to do this

Gallon, quart and pint are volume units. Think of a gallon of milk, a pint of beer, etc.  4 quarts make a gallon and 2 pints make a quart.

List out the addition problem.
1 gallon + 3 quarts + 2 quarts + 3 pints

combine like amounts
1 gallon + 5 quarts + 3 pints

Start with the smallest size (pints) and change to larger size unit if possible.
Remember:
2 pts = 1 qrt 
4 qrt = 1 gal

1 gallon + 5 quarts + 3 pints
*The 3 pints becomes 1 quart + 1 pint

1 gallon + 5 quarts + 1 quart + 1 pint
1 gallon + 6 quarts + 1 pint
* 4 quarts make a gallon, since there's 6 qrts = 1 gal + 2 qrts

2 gallon + 2 quarts + 1 pint

The equation of the midline is y=4.

the midline is the line that the function oscillates around. basically, the average of the maximum and the minimum will get you the midline. eyeballing it, it looks like the function revolves around the horizontal line y=4.

the distance between the midline and the maximum is the same as the distance between the midline and the minimum.