The rectangle shown has a perimeter of 86 cm and the given area. its length is 3 more than four times its width. write and solve a system of equations to find the dimensions of the rectangle.

The price of a coat increased from $78 to $92. what is the price increase percentage?

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?