The numbers 1,2,...,n are written on the board. Every minute, I erase two numbers a and b, and replace them with a+b+ab. Clearly, after n-1 minutes there is only one number left on the board. Does the result depend on the order? For which n can I make the resulting number be odd?

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 is c

step-by-step explanation:

step-by-step explanation:

96 39 cause 135 -96=39 im smart (i used a calculater)