Find the mass of the wire that lies along the curve r and has density ?.C1: r(t) = (4 cos t)i + (4 sin t)j, 0 ? t ? ;C2: r(t) = 4j + tk, 0 ? t ? 1; ? = 3t3

A. 2?³ units
B. units
C. ?³ units
D. units

Answer: D

Mathematics

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The amount S, in billions of bushels, that a country is willing to supply depends on the price P, in dollars per bushel, of wheat. The relationship is

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The demand D, in billions of bushels, is the quantity of wheat that customers will buy at a price of P dollars per bushel. The relationship is
.
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A: Solve the latter equation for D and so express the demand as a function of the price P.B: The equilibrium price is the price at which supply and demand are the same. Find the equilibrium price.

What will be an ideal response?