exam Maths Puzzle Numerical Ability

I need to sketch the graph of the function and Identify the vertical asymptote.

f(x)=-2 log base3^x

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exam Other Question

A rectangular garden has dimensions of 18 feet by 13 feet. A gravel path of uniform width is to be built around the garden. How wide can the path be if there is enough gravel for 516 square feet? 4x-1 2
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xsq+3x-10 x+5