Please help me with these 4 questions

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

Choosing a booth location: your manager is sending two people to work at the conference. she wants a booth that will give your company good visibility for no more than 35% of the total budget ($3000). the conference coordinator just told you there are only five booths left. which booth will you choose? write the inequality that shows how much money you can spend on the booth simplify the inequality that shows how much money you can spend on the booth.

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