Combine like terms !-3r - 5 + 2r - 3r - 2s
HELP ASAP

2÷6+1/2 to the second power plus one

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?

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5