Given z varies jointly as x and y, use the given values to find an equation that relates x, y, and z. X = 3, y = 8, and z = 54
A)
Z= 9/4xy
B)
z = 2.25xy
C)
Z=4/9xy
D)
z = 36xy

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?

Ihave trouble finding the nth term of a linear sequence

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.