exam Maths Puzzle Numerical Ability

Hi! I was wondering, I know this may be kind of elementary and seem like a stupid question, but I was wondering if you could possibly help me with a problem dealing with logarithms?

8logt-4logs+7logv

Thank you so much!!

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exam Other Question

A map has a scale of 1 centimeter : 8 kilometers. Use the given actual distance to find the distance on the map.

28. 80 km

Any help with this equation would be Greatly</b> appreciated.
Find the measure, in degrees, of the largest exterior angle of a convex polygon whose exterior angles have measures in the ratio 1:2:3:4:5.

My work: 15x = 180 x = 12 ?