Discover Questions

What is the sum of -18 + 13? Prove that span (U ∪ W) = U + W, where U+W={u+w:u ∈ U and w∈W}? Aren't we creating Energy from an electric motor that receive a horse power for one hour of work produced? If you are dealt 44 cards from a shuffled deck of 52 cards, find the probability of getting two queens and two kings? Are bees self aware? one kept following me for like 3 days and it felt like he doing it on purpose?