exam Maths Puzzle Numerical Ability

make w the subject:

U(2)=U(1)e(W/PV)

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exam Other Question

Suppose that 25 percent of all the wise people are nice and half of all the nice people are wise. Suppose further that 25 percent of all the people are neither wise nor nice. What Find the distance between the lines with the following equations.

3x-y+4=0 and 3x-y=0