exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Given the digits 1, 3, 6, 9, find the probability that a four digit number formed by using each of them only once is divisible by 7. Can someone please help me with this I have to write this fraction in simplest form

-15x^3 y^3/-20xy^4