What is four times the difference of -15 and 7 amounts to -88

-1

Step-by-step explanation:

4(-15-7)x= -88

4(-22)x= 88x=-88

x=-1

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