A) Find the critical numbers of f

f
(if any).

b) Find the open interval(s) on which the function is increasing/decreasing

c) Apply the First Derivative Test to identify all relative extrema

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

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