exam Maths Puzzle Numerical Ability

What is the formula for sound measured in decibals? pick a sound,give decibals of the sound and explain what this measurment means?

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exam Other Question

Find the minimum of P(x) = 3x^2 + 6x - 1. What would X and Y equal if:
-5x + 2y = -5

-5x + y = 0

I think y= 0
And x= 1

But im not sure if thats right or not.

Any help please?