Solve the system.

{m+n=5
{m−n=3

use the substitution method.

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.

What statement is true? 2x^2-9x+2=-1

Factor the expression using the gcf. the expression 21m−49n factored using the gcf