What does this even mean

Step-by-step explanation:

If a = 2d + 5r , which question is solved for r ?

5r = a-2d

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r = (a-2d)/5

B.  

Step-by-step explanation:

This is a literal equation so you have to figure out the equation that solves for r.      

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