exam Maths Puzzle Numerical Ability

i cannot figure out this question at all : 4a^4 b - 9a^2 b^3

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exam Other Question

The latitude of Princeton, New Jersey, is 40.5 degrees north of the equator. How far is it from Princeton to the equator if the diameter of the earth is 7920 miles? formula for measuring sound in decibals?
pick a sound give decibals of the sound, and explain what this measurment means.

If you could just give me an example that would be great this question has stumped me!!! Thank You!!