Please help asap!! (slopes) (brainliest)

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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?

X2 + y 2 = 36 x + y = 6 solve the system of equations.