At 2pm, the temperature was 9°F. At 11pm, the temperature was -11°F. What was the change in temperature?

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

Brad earns $12.75/hr and works 40 hours a week. what is his gross annual income?

What is the difference between a linear interval and a nonlinear interval?