Please help meee! Please I need to write an equation for all of them in vertex form !!! Please

If i have one apple and give you the apple, how many apples do i have?

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

If using the method of completing the square to solve the quadratic equation x 2 + 16 x + 24 = 0 x 2 +16x+24=0, which number would have to be added to "complete the square"?