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

given f(x)=5x+3,find f(0) Problem:
Find the slope of the line through the following pair of points
(-5,-3) and (-5,2)