(PLEASE ANSWER<3) Determine if the given equations are functions or not functions x = 3, x2(squared) + y2(squared) =81, y = -x + 11, y2(squared) -5x - 12, y = 2x2(squared) - 6x + 4, y = -7

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project