"Evaluate the piecewise function at the given value of the independent variable." is what the question asks, f(x)={ -2x+3 if x 5 (the > has a line under it)
Find f(-7)
I don't know how to solve this whatsoever, can someone please help?

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?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Which number line correctly shows 0.8 + 0.3?