Need with midpoint formula? question: if the midpoint between (x, 3) and (9, 9) is (7, 6), find the value of x.

could you show how to do this/what formula you use? i know the midpoint formula but my teacher acted like there's a different one needed to find the value of x as opposed to just finding the midpoint and i don't understand!

What is the area of the triangle 10 13 12

Which of the following three dimensional figures has a circle as it’s base

The two cylinders are similar. if the ratio of their surface areas is 9/1.44 find the volume of each cylinder. round your answer to the nearest hundredth. a. small cylinder: 152.00 m3 large cylinder: 950.02 m3 b. small cylinder: 972.14 m3 large cylinder: 12,924.24 m3 c. small cylinder: 851.22 m3 large cylinder: 13,300.25 m3 d. small cylinder: 682.95 m3 large cylinder: 13,539.68 m3