Suppose an investment of $5,000 doubles every 12 years. how much is the investment worth after 36 years? after 48 years?
write and solve an exponential equation.
( show all your work)

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?

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Does the point (1, sqrt 7) lie on circle shown.