exam Maths Puzzle Numerical Ability

Please factor. Thanks!

18x^2-30x

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exam Other Question

2 is what percent of 2.5?

Is this correct?
2/100= 0.02
0.02*2.5=0.05
0.05*100=5 I have no idea what this could be: y=2^x and y=log2x
It says to identify the graph that represents the corresponding function.
The lines are (1, -3) (0,0) (-5,1)
I really do