What special word do you use for the exponent of 2?​

You can say x to the power of 2 or you can say x squared.

Hope that answers your question!

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

answer: there are 453.592 grams in a pound.