exam Maths Puzzle Numerical Ability

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?

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exam Other Question

1. r-9/4
2. 6/19x
i AM HAVING PROBLEMS WITH THIS
Simplify
sqaure root7(9sqaure root2-3sqaure root7)

Thank you