Iam a square number whoes digits add up to 10. what number am i? justify answer with mathematical reasoning

What is the lcm of 16 and 40 ? 24 and 40 ?

Precalculus question, image attached.

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.