Mark owes his sister $15. He earned $20 for mowing the grass. He have 1/5 of his earnings to a local charity and then paid his sister. Does mark have enough to repay his sister the full amount? Why?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b