How do you represent, describe, and compare additive and multiplicative relationships?

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

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 shows the correct solution of the equation 1/2a+2/3b=50, when b=30?