In the game of blackjack, a 2-card hand consisting of an ace and either a face card or a 10 is called a "blackjack." if a standard 52-card deck is used, determine how many blackjack hands can be dealt. (a "face card" is a jack, queen, or king.)

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Find the area of an equilateral triangle with a side of 6 inches

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?