Someone show me how to solve word problems

Suppose the probability of selling a car today is 0.28. find the odds against selling a car today.

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?

What is the volume of the sphere shown below with a radius of 3?