Which expression can be added to the right side of the equal sign form an equation? 8•7 - 4= a. (2+9)x2 b. 10x3-6 c. 9x5+7 d. 9(12÷2)

left side = 52

9*5 + 7 = 52

So its C.

Hi!

8 * 7 - 4 = 52

8 * 7 - 4 = 9 * 5 + 7

Hope this helps! :)

-Peredhel

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