book Maths Puzzle Numerical Ability

I am not to sure as to how to write "log y -(log 7 + log f)" as a single log. I really need help with this

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book Other Question

find the nth term of the arithmetic sequence described,

-7,-3,1,5...for n = 35 What is the x-intercept of the line with the equation 4x + 2y=12? Please help me, Please!