Find the slope of the line passing through the points (-4,9) and (-4,-6).

Eric drew a scale drawing of a country park. the scale he used was 1 inch = 2.5 yards. the picnic area is 80 yards wide in real life. how wide is the picnic area in the drawing ?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

X2 + y 2 = 36 x + y = 6 solve the system of equations.