Find the coordinates of the midpoint hx. h (5 1/2, -4 3/4), x (2 1/4, 1 1/4)

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Which expressions equal 9 when x=4 and y=1/3 a. x2+6y b. 2x + 3y c. y2-21x d. 5 (x/2) -3y e. 3x-9y