Is (-1,2) a solution to the following system of equations? Show and explain why or why not. f(x)=x^2+3x+4
g(x)=2x+4

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?

What 620000 divided by 10 to the third power

Lisette takes an ela exam and got 16 out of 27 questions correct. what percentage of the questions did lisette get correct?