What is the curve : y= -2x

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Find the cosine function that is represented in the graph.

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)