Find the ratio a: b, if it is given that 1) 2a=9b 2) a/5 = b/7 3) 6a−3b=5b 4) a+b=3b 5) a−2b/a+2b = 1/2 6) 2a−3b/5 = a+b/3

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)