15. Which of the following is an even function? a. y = 2x² + x³ b. y = 2x¹ + 11 16. Simplify loga 4 + loga 10 - loga 5 a. loga 8 b. loga 9 c. y = 2x4. c. loga aº - X d. y = -x³ + x² d. loga a¹/9

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