The oxygen equivalence number of a weld is a number that can be used to predict properties such as hardness, strength, and ductility. The article “Advances in Oxygen Equivalence Equations for Predicting the Properties of Titanium Welds” presents several equations for computing the oxygen equivalence number of a weld. One equation, designed to predict the hardness of a weld, is X=O+2N+(2/3)C, where X is the oxygen equivalence, and O, N, and C are the amounts of oxygen, nitrogen, and carbon, respectively, in weight percent, in the weld. Suppose that for welds of a certain type, 
a. Find 
.
b. Suppose the weight percents of O, N, and C are independent. Find 
.
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The Confederacy enlisted slaves into their army as fighting soldiers
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While having a discussion, Technician A says that the braking system on a hybrid vehicle has the same parts as a conventional braking system. Technician B says that the system has regenerative braking, and computer controls operate the hydraulic brake system. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
Stripping a stem, coating the wound in a rooting hormone and wrapping it in damp media is a propagation method called _____
a. tissue culture c. air layering b. cuttings d. separating
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A) Withdrawal B) Alternating C) Pecking D) Chipping