Please could I have some help? Seven squared equals seven times

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

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Rob filled 5 fewer plastic boxes with football cards than basketball cards. he filled 11 boxes with basketball cards.