book Maths Puzzle Numerical Ability

I feel stupid asking this question but, Is there a differnce between a logarithm of a product and the product of a logarithm? If there is a differnce can you explain it to me?

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book Other Question

Are the following lines parallel, perpendicular, or neither?
L1 through (-4, -7) and (1, 3)
L2 through (2, 6) and (4, 10) The supplement of an angle is 20 degrees larger that the angle. Find the measure of the angle. Thanks for the help!