How to find the length and width of a rectangle when given the perimeter?

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.

The value of cos 30° is the same as which of the following?

Rewrite the polynomial -9x5 + 36x4 + 189x3 in factored form.