Help meee please

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?