exam Maths Puzzle Numerical Ability

find all points having x coordinates who's distance from the point -2,-1 is 5.

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exam Other Question

I need help with the difference of cubes.

125x^3-27 Kwan hiked up a hill at 4km/h and back down at 6km/h. His total hiking time was 3h. How long did the trip up the hill take.
The way I did it I came u with 2h, but the book says 1h