exam Maths Puzzle Numerical Ability

Rational Expressions

divide
4/(x -6) by 40/(7x - 42)

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exam Other Question

I am not able to figure these out. Can someone help me through a couple

1.) log4x+log4y-log4m

2.) ln54-ln6

3.) log(x-2)-log(x-2 lines a and b are perpendicular. The slope of line a is given. What is the slope of line b?

3