book Maths Puzzle Numerical Ability

Please help me solve this question:(4h^5-9^3+4)+(6h^5-9h+4)

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book Other Question

the answer to the following should be 4/3a, however, I cannot understand how - please help! Thank you!!

1/1.5 + 1/1.5= 6 square root 3 over 4+5 square root 3