When evaluating (6x+9)^2 - 5 for x = 1, the given value of 1 is substituted for what part of the expression? a. the exponent b. the constant c. the variable d. any numerical value

The answer is C, I took the test.

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: 298143

step-by-step explanation: