exam Maths Puzzle Numerical Ability

Simplify
Square root of -6 & square root of -2

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exam Other Question

A boat can go 33 mph in still water. It takes as long to go 300 miles upstream as it does to go downstream 360 miles. How fast is the current?

Will someone please explain this to me? Tutor,

I do not think I am understanding how to solve this problem could you please help me?

Find the distance between each pair of points:

(-3,0) and (4,0)

Any explanation would help me with this problem. Thanks.