exam Maths Puzzle Numerical Ability

solve the following equation for x: 64=2^3x.
a.x=1
b.x=2
c.x=2.5
d.x=3

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exam Other Question

one third of a three-digit number whose units digit is x, ten digit is 5 and hundreds digit is three times the units digit Find all positive values for k for which the following can be factored.

x^2+x-k

I have no clue what to do with this......can you please help me? Thank you!