exam Maths Puzzle Numerical Ability

Simplify the expression. - 7x/6 - x/5

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exam Other Question

Expression 1: 2log(x+1)
Expression 2: 2log(2+x)
Expression 3: 4+log2+3logx

How would the sum of these 3 expressions be written as a single logarithm?

thanks in advance if y varies inversely as x^2 and y=2 when x=4, what is the constant of variation?