What is a good algebra calculator that is free to use

Based on what i know about mean, this doesn't add up.

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.