3 years ago

Number of feet in a mile

Mathematics

2 answers:

8090 [49]3 years ago

8 0

Answer:

5,280 feet in a mile

Alisiya [41]3 years ago

6 0

Answer:

5280

Step-by-step explanation:

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Replace f(x) by y

$y=69-15x\\Interchange \; the \; variables\\x=69-15y\\solve \; for \; y\\x-69=-15y\\Divide \; by \; -15\\\frac{-x+69}{15} =y\\Replace \;y \;with \; f^{-1}\\f^{-1}=\frac{-x+69}{15}$

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