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17. Evaluate 2x2 - 3x - 6 when x = -4. 18. Evaluate 5x2 + axy - y2 when x = 3 and y =

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17. Evaluate 2x2 - 3x - 6 when x = -4. 18. Evaluate 5x2 + axy - y2 when x = 3 and y = -3. 19. Find the area of a trapezoid with an altitude of 12 meters and bases of 6 and 7 meters 20. Find the area of a circle with a radius of 6 meters. Use p E 3.14. 21. Find the amount A to be repaid on a principal of $8000 borrowed at a simple interest rate r of 5% for a time t of 3 years. The formda is A = Q1 + rt)

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