Answer:
x = 9
Step-by-step explanation:
I think you wrote the question wrong (I am assuming that there is a x next to the -3).
Subtract 7
-27 = -3x
divide by -3
9 = x
32:33 is the ratio because 65 total students subtract 32 boys leaves 33 girls.
This sin graph doesn't have a phase shift and its vertical displacement (d) is zero, so you don't need to include it in the equation of y = asin[b(x-c)]+d.