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HELP QUICK PLEASE!!!!!!

If a trapezoid is 3 inches tall, it's longest base is 8 inches wide, and the area is 21 inches squared, what is the length of the missing base of the trapezoid?

HELP QUICK PLEASE If A Trapezoid Is 3 Inches Tall Its Longest Base Is 8 Inches Wide And The Area Is 21 Inches Squared What Is The Length Of The Missing Base Of class=

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