If 42z = 5000, then which of the following must be true? (A)
2 < z < 3

(B)
3 < z < 4

(C)
4 < z < 5

(D)
5 < z < 6

(E)
6 < z < 7

An appliance store sells a washer-dryer combination for $1800. if the washer costs $300 more than the dryer, find the cost for each appliance.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Which table shows a proportional relationship between miles traveled and gas used?