A piece of machinery depreciates $5000 the first year, $4700 the second year, and $4400 the third year. If the
rate of depreciation is constant, what is the amount of
depreciation of the piece of machinery in the sixth year?
A $3500
B $59,500
C $44,500
D $3200

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?

What is the value of x in the this question ?

How do you determine if an ordered pair is a solution to a given equation?