exam Maths Puzzle Numerical Ability

You go 50 km West, then 20 km North. How many km are you from where you started?

Can someone explain to me how to slove this question please and thank you.

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I keep trying to study it and figure it out, but I just am not getting it. I'm just wondering if you can explain the concept of finding the domain and range to me. For example: g Please help me solve (divide) this equation in factored form:

8a^2-6a-9/6a^2-5a-6/4a^2+11a+6/9a^2+12a+4