exam Maths Puzzle Numerical Ability

If logk4=2/3 then k=?

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exam Other Question

please help me with this I really do not understand what to do.
if f(x)=5x-1 find the following,
f(-2) How would you solve the following system of linear inequalities:

2[less than or equal to]x[less than or equal to]5
1[less than or equal to]y[less than or equal to]3