What is the domain and range of squard root of x+2

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?

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Which is an equation for the nth terms of the sequence 12,15,18,21