Find the product of x - 9^ 2 squared power and explain how it demonstrates the closure property of multiplication. and explain how it demonstrates the closure property of multiplication.
x^2-81 is a polynomial
x^2-81 may or may not be a polynomial
x^2-18x+81 is a polynomial
x^2-18+81 may or may not be a polynomial

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Daniel expanded the expression as shown below -2(-8x-4y+3/4)=-10x-8y-11/4 what errors did he make? check all that apply

What is the slope of the line shown below?