exam Maths Puzzle Numerical Ability

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

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exam Other Question

hello i need help to simplify this
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|
| 18x^5
| -----
| y^2
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