HJ = 4x + 9
Jk = 3x + 3
KH = 33

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 equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?