Amelia bought a pair of shoes for $135 and some t-shirts that cost $21 each. Define a variable and write an expression that can be used to determine how much money Amelia spent. If Amelia bought 4 t-shirts how much money did she spend before taxes.​

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)