- If 0 <= u <= pi/2 and x=sec u, then sqrt(x^2 - 1) = f(u), where f(u) equals?

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How does geological time scale relate to biology? What does as much as mean in math? 5 – 6 ≠ 6 – 5 , for which uses this as a counter example?
A.+ is Associative B.+ is Commutative C.- is Associative
D.- is Commutative? ANY HELP IS APPRECIATED!!!! Find the vertex of the following quadratic functions.
(a) f(x) = -5(x - 6)^2 + 9 (b) f(x) = -x^2 + 4x - 1? How many grams of sodium chloride are required to make a 1.0 L solution with a concentration of 3.5 M?

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