Which expression represents the algebraic phrase "nine times a number plus thirteen"? 9 minus y + 13 9 + y minus 13 9y + 13 13y + 9

Which expression is equivalent to sq-80

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)