Solve this trignometric equation by squaring

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.