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~ x + y + z = 3, x² + y² + z² = 5, x³ + y³ + z³ = 7 ➪ x⁴ + y⁴ + z⁴ = ? Why erythrocytes have a light section in the middle? How can i determine crop coefficient of constructed wetland macrophytes? Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? Is three days enough to study for a calculous test?