Arepair bill for your car is $553. the parts cost $265. the labor cost is $48 per hour. write and solve an equation to find the number of hours of labor spent repairing the car.

I’m stuck on this i don’t understand.

Shiny white dental insurance costs $258 per year. approximately one-third of insured people need a filling, which averages $110 each. 80% of insured people get a preventive check-up each year, and the average cost of this visit is $95. if you consider shiny white’s income and expenses, what is the expected value of each insured customer?

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15