book Maths Puzzle Numerical Ability

please help me solve this inequality

j - 8 < 4
-
4


( j over 4 -8 < 4)

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book Other Question

How would you solve this problem?

Write as a single Logrithm: 2 ln x + 3 ln x + 8 ln (Square root x).
A = 1/2h(B+b)

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solve for b