exam Maths Puzzle Numerical Ability

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what is the difference between the sum of the prime factors of 18 and the sum of the prime factor of 25?

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exam Other Question

Evaluate using the change of base formula. Round to 3 decimal places.

log3 3.5
The length of a rectangle is 1cm longer than its width.
If the diagonal of the rectangle is 4cm, what are the dimensions of the rectangle?