An integer is a number that is not a fraction so no 3.7 is not an integer
Answer:
The second graph near the bottom with a Y-intercept of -1
X stands for the score of her first test
Y stands for the score of her second test
I'm assuming you meant shirts instead of shorts for the older brother.
1/6 + 3/6 = 4/6
4/6 of the shirts belong to his brothers
(or 2/3 if you simplify the fraction)