exam Maths Puzzle Numerical Ability

Add, using the vertical method.
5x^2 + 2x - 4, x^2 - 2x - 3, and 2x^2 - 4x -3

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The chemical formula for sulfuric acid is h2so4. If the weight of the acid was 1470 grams, how much did the sulfur weight? (h : 1, s : 32, O 16) Question: One serving (half cup) of cooked peas contains 45 more calories than one serving of cooked carrots and 50 more calories than one serving of cooked green beans. If one se