The answer is
B.
Consider the fraction

.
Both the numerator and denominator, when by themselves, are irrational.
However, when they are divided, they result in the rational number

.
When

have the same irrational factor, the irrational factor will be cancelled from the fraction and (possibly) leave a rational number.
She has 19 total.
Start out with 9 blue.
7 fewer yellow would be 2 yellow.
4 times as many green as yellow is 2 times 4 which is 8.
9+2= 11
11+8= 19
Right triangle
sin(38) = cos(52)
answer
cos(52)
hope it helps