## Elementary Algebra

The first time 32 students were in class. The second time, 28 students were in class. To find the percentage change, we use the following formula: percentage change = $\frac{New\ amount\ -\ Original\ amount}{Original\ amount}$ $\times$ 100% The original amount is 32, and the new amount is 28. We substitute these values into the formula to obtain: percentage change = $\frac{28\ -\ 32}{32}$ $\times$ 100% percentage change = $\frac{-4}{32}$ $\times$ 100% percentage change = -0.125 $\times$ 100% percentage change = -12.5%