Match each formula to its correct description.

1. simple interest i = prt

2. distance r = d/t

3. time money is invested r = l/pt

4. rate of speed t = i/pt

5. rate of interest t = d/r

6. time spent driving d = rt

Answer: Below are the correct matches for each one.

The key is to look at the first letter in the formula. If it involves money and interest, use I = PRT. If it involves distance and times, use d = rt. Each equation is just a manipulation of one of those equations.

1. simple interest i = prt

2. distance d = rt

3. time money is invested t = i/pt

4. rate of speed r = d/t

5. rate of interest r = l/pt

6. time spent driving t = d/r