exam Maths Puzzle Numerical Ability

State the domain of the following

m(x)= 5/x^2+9

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exam Other Question

Find all of the zeros of the polynomial function and state the multiplicity of each.
f (x) = (x^2– 9)^2
The decibel level of sound is given by D=10log(I/10^-12), where I is the sound intensity measured in watts per square meter. Find the decibel level of a whisper at an intensity of 5.4*10^-10 watts per square meter.