Help on a chemistry problem

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

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)