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

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2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z =6 THere are 10 pictures available to place on exhibit in a museum. How many arrangements (permutations) are possible if 7 pictures are selected at a time?