exam Maths Puzzle Numerical Ability

I am trying to write each expression as a single logarithm this is the problem i am stuck on

ln(x+2)-7ln(x)+3ln(x+7)

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exam Other Question

Solve the system by using the addition method. -0.1x+0.05y=5 and 0.05x+0.06y=2.7 What is x? How do you find the perimeter of a figure if it shows you a variable added to the number one over four for the width, and a variable over 3 for the length?