Represent proportions by equations is a free educational video by Khan Academy.It helps students in grades 7 practice the following standards 7.RP.A.2.C.
1. 7.RP.A.2.C : Represent proportional relationships by equations. For example, if total cost t is proportional to the number n of items purchased at a constant price p, the relationship between the total cost and the number of items can be expressed as t = pn..
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