exam Maths Puzzle Numerical Ability

Find the slope of a line whose equation is y= -6x+3

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exam Other Question

Given that two sides of a triangle are 20 and 66. Find the range of possible measures for the third side, s

I got 46 < s < 86

is this correct?
How can you calculate the maximum number of unique Iowa license plates that can be made from a series of 3 numbers followed by a serias of 3 lowercase letters?