The ratio of boy to girls was 15: 11 if there ware 435boys, find the number of girls.

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?

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?