Yes, 30 degrees is an acute angle.
Yes, 0 3 and 0 30 are equivalent.just add an imaginay 0 to 0 3.
It's 1 x 1030 or just 1030 or 1 nonillion (for the U.S. and scientific types) or 1 quintillion (for the rest of the world).
x is 30
2,3,5,7,11,13,17,19,23 & 29
It is Military slang. It is usually used to refer to any time when the sun isn't up, usually between mid-night and 4 am or so. Most operations start at Oh dark thirty, much earlier than a normal...