Apple stock rose from $75 per share on january 1, 2013 to $109 per share on january 1, 2015. during the same period, microsoft stock rose from $27 to $47.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180