For the 9 of you who actually downloaded and attempted the homework, I appreciate your diligence. Here are some resources for you.
First μ is a prefix meaning micro, or 10^-6. So when you see 5.7μC, we’re talking about 5.7*10^-6 coulombs
For an Electric Field calculation, Q2 is usually just a single electron, or a single proton. Use the calculator above, then divide the answer you get by the charge of that single electron.