exam Maths Puzzle Numerical Ability

"How do you solve 4x-9=7x+12"

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exam Other Question

Solve to four decimal places:log(4) (x-9)=2.

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The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 3 seconds when the length is 36 inches, what is the period when L=5.0625 inches?