exam Maths Puzzle Numerical Ability

Evaluate |-30|x|1/5-1/3|. Thank you for your help!

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I have a total of 4 questions I need help on, & thank you guys in advance.

. Suppose you have a lemonade stand, and when you charge $1 per cup of lemonade you sell 50 cups. Bu Use appropriate identities to find the exact values of the following.
a. sec(75degrees)
so far I have sec(45deg+30deg)? then stuck.

b. sin(7pi/12)
I think this converts down to sin(2pi/3)? then stuck.