- Are all plastics also polymers?

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AND THIS ONE PLEASE? Find the equation of the line tangent to the curve y= (x^2+3)^(1/2) that is perpendicular to the line 2x - y +7 = 0.? Need help with reducing a matrix with a variable to reduced row echelon form? Two vectors beginning at the same vertex of a triangle are 〈-5,3〉 and 〈3,5〉. Choose the correct classification of the triangle? What is the total pressure if a container contains 64 torr of He gas, 355 torr of N2 gas, and 20 torr of Ar gas?