Piano lessons cost $15. what expressions could be used to find the cost in dollars of 5 lessons.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x