exam Maths Puzzle Numerical Ability

1. r-9/4
2. 6/19x

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exam Other Question

This is actually an rational expression which I am sure it is a difference but here it is.

Simplify--

2r^2+3r-20s^2 from 4r^2-25s^2.
Find the distance between (-3, -2) and (1, 4)...Am I doing this right, to keep it short my answer is 2 sqrt of 5 am I right?