Solve each of the following equations for y. don't forget to simplify any fractions you come across. (These are 3 questions to answer)

3x - y = 16

x + 4y = -31

-5x - 9y = 23

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?

I’m which figure is point g an orthocenter

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).