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Let the height be x:-

If: 0.5*(8+20)*x = 98 square units

Then: x = 98*2/8+20 => x = 7

Therefore height of the trapezoid is: 7 units

Check: 0.5*(8+20)*7 = 98 square units

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Q: What is the height of a trapezoid whose area is 98 and the bases are 8 and 20?
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