book Maths Puzzle Numerical Ability

Find the numberof possible 5-card hands that contain the cards specified.
5 face cards

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book Other Question

Yuri has a board that is 98 in. long. He wishes to cut the board into two pieces so that one piece will be 10 in. longer than the other.What should the lenght of each piece be? Evaluate the following to 4 decimal places. tan3.75 radians
I put down...
tan3.75(pi)
15(pi)/(divided by)4=180/(pi)
tan675-(360)
tan45=-1.0000
but i got it wrong on my test, can you show me what i did wrong?