Asmall concert hall has an area of 90,000 square feet. the population density at the last performance was 0.015 people per square foot. how many people attended the last concert?

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account