Which describes a method for solving systems of equations in which you
plug in an expression for one variable written in the terms of the other?
O
A. Plug-in method
O
B. Substitution method
O
C. You can't tell.
D. Elimination method

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?

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120