Solve the problem.Regrind, Inc. regrinds used typewriter platens. The variable cost per platen is $1.50. The total cost to regrind 90 platens is $400. Find the linear cost function to regrind platens. If reground platens sell for $8.00 each, how many must be reground and sold to break even?
A. C(x) = 1.50x + 265; 28 platens
B. C(x) = 1.50x + 265; 41 platens
C. C(x) = 1.50x + 400; 62 platens
D. C(x) = 1.50x + 400; 43 platens
Answer: B
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Find the curvature of the space curve.r(t) = 
(1 + t)3/2i +
(1 - t)3/2j + 2tk
A. ? = 
B. ? = 
C. ? = 
D. ? = 
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Perform the conversion. Round to the nearest hundredth when necessary.22 km = ____ mi
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