I have another one sry out fated meme but i need 1-1 is it 0? or is it -1

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Tom drove 206 miles in 3.9 hours. estimate his average speed.