Correct answer only what number needs to be added to both sides of the equation in order to complete the square?

It be 81.

You have to take half of -18 which is -9, and square that, which is 81.

there will be 35 boys in each team. : )

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.