How many committees of five can you make out of eight people

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Suppose a ball is dropped fromca height of 6ft. it bounces back up but time it bounces, it reaches only 7/10 of its pervious height. what is the total of each height that the ball reaches after 5 bounces

Nine more than four times a number is the same as one less than twice the number. find the number?