The sum of two numbers is 70. The difference of the two numbers is 26. Enter and solve a system of linear equations to find the two numbers. Let x represent the greater number and y represent the lesser number.

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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?