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What is the quadric regression equation that fits these data

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible