exam Maths Puzzle Numerical Ability

THE COORDINATES FOR A RECTANGLE ARE (3,11), (3,6), (9,6), AND (9,11).WHAT IS THE PERIMETER?

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exam Other Question

How do you solve the equation m - 2n = 9 if the domain is { -1, 0, 5}? The Iditarod sled-dog race extends for 1049 mi from Anchorage to Nome. If a musher is twice as far from Anchorage as from Nome, how many miles has the musher traveled?

I guessed it would be 1049 x 2 but that seems to simple...