book Maths Puzzle Numerical Ability

Express as a single logarithm and simplify:
logx+logy-logz-logw
how do I do this one?

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book Other Question

write the equation of the ellipse.

sum of focal radii is 14. foci at (0, square root of 13) and (0, - square rot of 13). Please help me solve this problem 5/4x+1/8x=3/8+x (x= )