Note the squares...
13 is possible because it is a sum of two squares (integers) 9 + 4 .. use (0,3) & (2,0) ... get the square roots and place on different coordinate axes... for a simpler value.
but there is none for 15...
there is one for 18 ...
18 = 3^2 + 3^2 ... try (0,3) ,(3,0) , (3,6), (6,3).
Answer:
Erica decrease representative Apples by 50%
(5,-3) is in the fourth quadrant, if it rotates 90 counter clockwise then it will be in the first quadrant. Your x and y values are going to swap, and you need to know what is true about the numbers since they are in the first quadrant. leave a comment if you need more help.
