Which of the following is a quadratic equation? a. 2r² + 4r - 1
b. 3t - 7 = 2
c. s² + 5s - 4 = 0
d. 2x² - 7x ≥ 3
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Which of the following is a quadratic equation? a. 2r² + 4r - 1
b. 3t - 7 = 2
c. s² + 5s - 4 = 0
d. 2x² - 7x ≥ 3
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