exam Maths Puzzle Numerical Ability

Hi, I am having trouble with this exercise:

11sin^2y = 13-3sin^2y for y, where 0<= y <360, How many angles satisfy this equation?

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exam Other Question

Michelle is eight years older than adam. Three years ago michelle was twice as old as adams was then. How old is Michelle?

-I just need to know how to set it up, very confused on that
Find x.

If a triangle of known measurement is 45 degrees.