book Maths Puzzle Numerical Ability

Please help me solve ln (x - 4) < 6

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book Other Question

(8 square root of 7 - square root of 5)(square root of 7 +3square root of 5)

(y+square root of 6)(y-square root of 6)

(6-square root of 11)squared

i hop when you are adding fractions with exponets do you have to find commom denomanator