Which shows 2^-2 * 2^6 in exponential form

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Write the fraction or mixed number and the decimal shown by the model