1-5x + 3y 45
2x+3y = 24

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?

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?