Expanding the right side:-
5x - 4 = 5x - 15 + 11
5x - 4 = 5x - 4
left side = right side so there are infinitely many solutions
I believe the answer is
sin(6x)
With my calculations I got 0.12 per pound.
There are 52 cards in a standard deck and 13 cards with spades among them.
Probability: ( 13 C 2 * 39 C 4 ) / ( 52 C 6 ) =
=
