Please find all that it asks? Thanks!

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1 Answer
Jim G.
Dec 10, 2017

#"see explanation"#

Explanation:

#"the cost "color(blue)"varies directly ""with length"#

#"let cost "=c" and length "=l#

#rArrcpropl#

#"to convert to an equation multiply by k the constant"#
#"of variation"#

#rArrc=kl#

#"to find k use the given condition"#

#0.8" metres costs "$5.60#

#c=klrArrk=c/l=5.60/0.8=7#

#"equation is " color(red)(bar(ul(|color(white)(2/2)color(black)(c=7l)color(white)(2/2)|)))#

#"3.25 metres costs"#

#c=7xx3.25=$22.75#

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