exam Maths Puzzle Numerical Ability

Please help me solve this problem. [[[[2h-6 2]]]]]]
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exam Other Question

Formula: log base b times a = log a/log b

Using the formula, find log base 2 10000. Round your answer to the hundreth's place. Express the following into single logarithm:
a.) log3 13 + 2/3 log3 7 - 2 log3 4
b.) log7 72 + 1/3 log7 36