Which of the following is related to the tension inherent in the metaphor, "A plane is a chalkboard that extends infinitely in all directions"?
a. Chalkboards and planes are both flat objects
b. Planes are frequently represented in textbooks with trapezoidal drawings
c. Chalkboards have thickness, but planes do not
d. Chalkboards are outmoded pedagogical devices
Ans: c
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For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (t - 6)i + (ln(sec t) - 3)j + 9k, -?/2 < t < ?/2; normal plane at t = 2?.
A. x = 2? + 6 B. x = -2? - 6 C. x = 2? - 6 D. x = 6 - 2?
Find the work done by F over the curve in the direction of increasing t.F = xyi + 3j + 5xk; C: r(t) = cos 2ti + sin 2tj + tk, 0 ? t ? 
A. W = 0
B. W = 
C. W = 
D. W = 
In the following exercise, assume straight-line appreciation. ? An antique table is expected to appreciate $40.00 each year. If the table will be worth $140.00 in 2 years, what will it be worth in 7 years? Round your answer to the nearest cent. ?
A. $420.00 B. $500.00 C. $792.20 D. $280.00 E. $340.00
Solve the problem.A caterer uses special stacking ovens to prepare large amounts of food. Find the total number of servings that can be prepared in one hour.Pizza: 6 servings per panNumber of pans per oven: 3Pan changes per hour: 2Number of ovens: 4
A. 36 servings B. 94 servings C. 72 servings D. 144 servings