exam Maths Puzzle Numerical Ability

x + 4 over 3 - x - 5 over 6 = 4

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exam Other Question

Multiply: 7u^6 * 4u^3
Multiple choice answers.
A) 11u^9
B) 11u^18
C) 28u^18
D) 28u^9

I get 28u^18 is this right? Please help me with this problem.
√(98x^3)