I need help with how to solve this question. The answer is 6.25 I just don't know how. You deposit $2000 in an account that earns simple interest at an annual rate of 4%. How long must you leave the money in the account to earn $500 in interest?

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?

Find the value of the variable and the length of each secant segment.

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?