exam Maths Puzzle Numerical Ability

simplify:

sqrt72

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I'm trying to figure out a way to solve this equation. i'm thinking that i need to add my own random number in and my own operation, but im not sure

write each equation in stand Find the slope, if it exists, of the line containing the pair of points.
(-2.3,4.2) and (-1.9,3.1) the slope m=