Question 607106
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Hi,
Note: Labeled Your Inquiry:  Alegebra:Proportions
If s varies directly as t^2, and s = 125 when t = 5, find s when t is 7.
Let k represent the constant defining this direct porportion
 {{{s = kt^2}}}
 {{{125 = k5^2}}}
 125 = k·25
   5 = k
 {{{s = highlight(5)7^2}}}
 s = 5·49 = 245