exam Maths Puzzle Numerical Ability

a@b = a+(b+1)

is @ associative (use variable to prove)

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exam Other Question

Find the distance to the nearest hundredth between the points (11,-6) and (-1,-2)
Please explain how this is done, I have several of these on a worksheet and I donot understand them. Technology. Driving down a mountain, Tom finds that he has descended 1800 ft
in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth.