For a poker hand, 5 cards are dealt at random from a standard 52 card deck

For a poker hand, 5 cards are dealt at random from a standard 52 card deck. (13 different cards in each 4 suits) Find two things: 

1) Find the total number of poker hands which have AT LEAST 3 aces.

2) Find the total number of hands with a straight. A straight is 5 cards with consecutive denominations which are not all in the same suit. (So, exclude straight flushes. An ace may be counted high or low, so (10, jack, queen, king, ace) is a straight, as is (ace, 2, 3, 4, 5).