How do you find the equivalent expression to something? ex: 4d+6+2d

Abouncy ball is released from a certain height. on the first bounce, it travels 32cm. with each subsequent bounce, it travels 9/10 the distance of the previous bounce. what is the total distance that the ball has traveled when it completes its 25th bounce?

Julian wrote the following numeric pattern on the board3,10,17,24,31,38.what numbers of julian's pattern are compound numbers.

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d? are he re