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The distance is about 7.21 (square root of 52)
Using the Law of Pythagoras, just calculate the square root of (42 + 62). That is, calculate 42 + 62, then take the square root of the answer.
(Note: 62 is the same as (-6)2, so it doesn't matter if you change it to positive first, as I did.)
7.62
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The distance is about 7.62 (units).sqrt (9 + 49) = sqrt 58 = 7.61577
Distance = sqrt(62 + 72) = sqrt(36 + 49) = sqrt(85) = 9.2195