book Maths Puzzle Numerical Ability

find the exact value of cos 105 degrees WITHOUT USING TABLES OR A CALCULATOR. be sure to show your work.

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book Other Question

Can you tell me how to set this problem up?
1. Suppose the club earned a total of $181 for washing 49 vehicles. If they charge $3 for a car and $5 for a truck, how many of each vehicle were sold? Could someone out there help me solve this problem?

Add:
3 h 20 min
4 h 25 min
+ 5 h 35 min

Thanks,
Sher