(a+b)^7= a^7+ 7a^7b+ 21 a^6b²+ 35a^5b³+ 35 a⁴b⁴+ 21 a³b^5 + 7a²b^6 + b^7
Sanford's gym coach made him run 20 laps on a 400 m track. How many kilometers did he run? How many miles?
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I took a picture because I had solved it on paper , but here you go .
