book Maths Puzzle Numerical Ability

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?

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Find the numberof possible 5-card hands that contain the cards specified.
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louise travels to her friends house at 10 m/h. While she is there it rains and gets a ride home at 25 m/h. It takes 1.5 longer for her to get there than to return home. How long