This is on my math test help me -2(2-2m) I do not get if you know how to do it answer the question

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Someone answer asap for ! a ball is rolled down a ramp. the height, f(x), in meters, of the ball x seconds after it is released is modeled by the function f(x) = x²- 10x + 25 for all values of x from 0 to 5. which statement about the ball is true? a. the maximum height of the ball is 5 meters b. the height of the ball increases from 0 to 5 meters above the ground. c. the ball has traveled 5 meters when it reaches the bottom of the ramp. d. the ball has been traveling for 5 seconds when it reaches the bottom of the ramp