The lifespan of a laptop battery is normally distributed. If the mean lifespan of a battery is 4 years with a standard deviation of 1.6 years, what is the probability that the next laptop battery you purchase will last between 3.5 and 5.5 years?

Jamie is hiking up a small mountain. he climbs up at a constant rate of 300 feet/hour until he reaches the peak at 1,500 feet. after that, he hikes down at the same rate to the base of the mountain. the equation that models jamie’s elevation, e, after t hours is e = . jamie’s elevation will be 600 feet after hours and after hours.

Which system of linear inequalities is represented by the graph? !

Find the balance at the end of 4 years if 1000 is deposited at the rate of