Lee has a jar of 100 pennies. she adds groups of 10 pennies to the jar. she adds 5 groups. what number does she say?

Find two numbers if their sum is 91 and the ratio is 6: 7?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

Determine domain and range, largest open interval, and intervals which function is continuous.