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Are my answers correct? How much hotter was the sun years ago? Simplify the algebraic expression
-2a^2+3b^2-5b^2-a^2? For the paraboloid z=f(x,y)=22-3x^2-2y^2, find the equation of the tangent plane at (1,2)? What is the molarity of potassium hydroxide solution if 25.00ml of KOH is required to neutralize 2.042g of KHC8H4O4 (204.23 g/mol)?

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