The point A and B lie on the circumference of a circle with centre O. the area of the circle is 81πcm². The length of the major arc is 15πcm. Calculate:

a) The radius of the circle
b) The length of the minor arc, giving your answer in the form lπcm².
c) The acute angle​

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?

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Solve 2x+y=3 x+y=5 in substitution method