exam Maths Puzzle Numerical Ability

find the distance between (-3,-2) and (1,4)

a 27

b 2 square root 5

c 2 square root 13

d square root 10

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exam Other Question

Prove that if and B are square martices and AB is invertible, then both A and B are invertible.
i am not sure where to start. I know that because it is a proof you can't use an e Solve for b. a = 1/2 bc2