exam Maths Puzzle Numerical Ability

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.

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exam Other Question
The start-up cost for producing widgets is $449, and each widget costs $91 to produce. Write the function relating x (number of widgets produced) with C(x) or the cost for producing that many widgets.

Thank you. v-4(4-v)=-2(2v-1)