exam Maths Puzzle Numerical Ability

For the exponential function e^x and logarithmic function log x, graphically show the effect if x is doubled.

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exam Other Question

An oil tanker can be emptied by the main pump in 4 hours and by an auxiliary pump in 9 hours. If the main pump is started at 9 a.m., when should the auxiliary pump be started so that the tanker is emptied by noon? Write the equation of the line passing through (3, -3) and (3, -6).