exam Maths Puzzle Numerical Ability

Please help.

Plot the graphs of TWO of the following four functions.f(x)=6x
1. f(x)=3x - 2
2. f(x)=(1/2)x
3. f(x)= log2x

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exam Other Question

A small city park consists of a rectangular lawn surrounded on all sides by a 330m sq. border of flowers 2.5m wide. Find the area of the lawn if the entire park is 5m longer than it is wide. A chemical solution contains 1% salt. How much salt is in 2.5ml of solution?
Would that be 1% x 2.5ml = .025?