(16 ÷ 4)3 – 6 i need help with problem

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

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.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?