What is response variable?

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?

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.