exam Maths Puzzle Numerical Ability

I need to change the equation y=4x-7 into standard form using integers.
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exam Other Question

write log2x=y in exponential form.

what does this mean?
Let F(x)=1-exp(alpha*x^bita) for x>=0, alpha>0. bita>0 and F(x)=0 otherswise. Show that F is a cdf and find the corresponding density.