Decide Whether the Proportion Is True or False $\frac { 25 } { 90 } = \frac { 100 } { 450 }$

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Q139: If s varies directly as t2, and

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Q141: How can you tell when an equation

Q143: True or false? This pair of equations

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Q145: An equilateral triangle has perimeter 33 inches.

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Q147: Let x represent the unknown, and