401k accounts are what type of accounts?

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 value of x in the equation 2(x-4) = 4(2x + 1)?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?