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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$800 at 5% annual interest, compounded semiannually, for 7 years. Hi Can I have some help with variations?

Boyle's Law states that the pressure P of a sample of gas is directly proportional to the temperature T and inversely proportional to th