A frame around a family portrait has a perimeter of 90 inches. The length is fifteen less than twice the width. Find the length and width of the frame..

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

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11