Tripled square of the difference of a and b

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.

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!