exam Maths Puzzle Numerical Ability

7+(-9)+(-5)+6

1/3+(-5/6)+(-1/2)

{-27+14}

{-8}+{3}={-8+3}

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exam Other Question

Solve for x:
(x+3)^2/3=4 Round to the indicated decimal place.

7.76338 four decimal places

A) 7.763 B) 7.764 C) 77.6340 D) 7.7634

Help me with this one please? Would the answer be D??