exam Maths Puzzle Numerical Ability

Find the exact value of cos^-1(cos(4pi/3)).

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exam Other Question

solve the equation and round the answer to four decimal places
(1+r/4)^20=3 help
which linear equations is best represented by a graph
A.1/2x-4
B.2x-4
C.1/2x+4
D.2x+4