exam Maths Puzzle Numerical Ability

i tried -15+42-16-17-21 and i got 41 but i dont know if it is right

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exam Other Question

Construct a proof of validity for the following valid argument using the 9 rules of inference.

1. (~M & ~N) > [(M v H) > (K & L)]
2. ~M & (C > D)
3. ~N & (F <> G) / K&~N Tony saved $60.70 one week ,$35.00 the second week, and $20.95 the third week. How much money did he save?