Solve pls brainliest

Is this a polynomial function? i need to know asap

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.

Fill in the missing exponents in each box and show how you found the answer. (4 points: 2 points for each correct answer with work shown) c. (9^4)^? =9^1 d.(5^? )^3=5^1 *question marks represent the boxes