iris spent 2 and 1/2 studying last night she spent 1/5 of the time studying how much time did she spend studying science
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The first (and most typical) way to find distance of two points is by using the distance formula.
One alternative is the Manhattan metric, also called the taxicab metric. This option is much more complicated, and rarely used in high school math. d(x,y)=∑i|xi-yi|