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
write an equation of the line that passes through each pair of points
#7
(5,1),(8,-2)

#9
(5,2),(-7,-4) If f(x)= 1/(2x) and g(x) = 3+x find (and simplify) the defining equation of the composition function fcircle g.