What is the inverse of the function f(x)= 15x+50/x+5

With finding limits of multi variable !

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%