exam Maths Puzzle Numerical Ability

Combine like terms.
6a2 + 4a + 5 + 3a2 + 7a � 2

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exam Other Question

Which of the numbers 18, 48, 452, 486 and 844 are divisible by 4?

Please help. My mind is NOT working today..lol Thank you so much. Given x delta y = x+y/x-y
8 delta w = 4/3
solve for delta w