exam Maths Puzzle Numerical Ability

Add. Simplify if possible.

2 + 1
over
9t to the third power 6t to the second power

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exam Other Question

The loudness of sound is based on intensity level measured in decibels using a logarithmic scale and is relative to (a ratio of) the weakest sound the ear can hear.

The formula
Four buttons have diameters of 5/8, 3/4, 9/16 and 7/8 inches. Which button is smallest?

a) 9/16 b) 7/8 c) 3/4 d) 5/8

Thank you for your help.