Please help me out with this

What is the average rate of change for this function for the interval from x=2 to x=4 ?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!