exam Maths Puzzle Numerical Ability

help
which linear equations is best represented by a graph
A.1/2x-4
B.2x-4
C.1/2x+4
D.2x+4

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exam Other Question

Find the exact value of cos^-1(cos(4pi/3)).
Solve for x: 9^x = 3
I think the answer is x=2







Solve for x: 2^9x-4 = 32