exam Maths Puzzle Numerical Ability

The CALC Company makes basic scientific calculators. Each calculator costs $2.25 to produce. The fixed costs of production are $10,500 per month. These calculators sell for $10.75

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2x-y=4
2x+3y=12
solve each system of equations by graphing each point. find the point of interception to determine if it a solution or no solution. Add:

29+(-42)+510+(-397)+52(-792)
Help me please. I do not understand am i supposed to subtract all the ones in parenthisis then add the rest, then subtract the total parenthisis from the total of the ones not in parenthesis?