Problems 10 - 12: ABCD is a trapezoid with midsegment EF. 10. AB= 23, EF = 29 and DC = 11x + 2. Find DC. 11. AB = 11, EF = -x + 21 and DC = 17. Find x. 12. AB = x + 2, EF = 2x + 3 and DC = x + 8. Find EF. E D B F C

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