If you take a brisk walk on a flat surface, you will burn about 258 calories per hour. You have just finished a hard workout that used500calories.

(a) Find a formula that gives the total calories burned if you finish the workout with a walk ofhhours. (LetCbe the total number of calories burned.)

C=

(b) How long do you need to walk at the end of your workout in order to burn a total of1100calories? (Round your answer to two decimal places.)

A cellular phone company offers several different service options. One option, for people who plan on using the phone only in emergencies, costs the user$4.75permonth plus$0.52perminute for each minute the phone is used.

(a) Write a linear function for the monthly costyof the phone in terms of the number of minutesxthe phone is used.

(b) Use your function to find the cost of using the cellular phone for18minin one month.

An account executive receives a base salary plus a commission. On$40,000in monthly sales, the account executive receives$3800. On$50,000in monthly sales, the account executive receives$4000.

(a) Determine a linear function that will yield the compensationyof the sales executive for a given amount of monthly salesx.

(b) Use this model to determine the account executive's compensation for$95,000in monthly sales.