Is 3^2 ⋅ 3^−5 equivalent to 1/3^-3

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

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax