exam Maths Puzzle Numerical Ability

using the periodic properties of trigonometric functions, find the exact value of the expression:
tan 17pi

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exam Other Question

Determine the value of m and b by rewriting the linear equation 12 = 8x + 2y in the form y = mx +b an oil tanker can be emptied by the main pump in 4 hours. an auxiliary pump can empty the tanker in 9 hours. if the main pump is started at 9am when should the auxiliary pump be started so that the tanker is emptied by noon?