May I please have help with my math ?! Thank you

Solve 3x-18=2y and 5x-6y=6 by elimination show work

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Question 1 of 10 2 points different groups of 50 graduates of an engineering school were asked the starting annual salary for their first engineering job after graduation, and the sampling variability was low. if the average salary of one of the groups was $65,000, which of these is least likely to be the average salary of another of the groups? o a. $64,000 o b. $65,000 o c. $67,000 o d. $54,000