Solve the problem.The temperature at 5:00 was -4°C. Four hours later, it was -13°C. What was the change in temperature?
A. 17°C
B. 9°C
C. -17°C
D. -9°C
Answer: D
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Find the gradient field of the function.f(x, y, z) = ex7 + y9 + z9
A. ?f = 7x6ex7 + y9 + z9i + 9y8ex7 + y9 + z9j + 9z8ex7 + y9 + z9k B. ?f = x6ex7 + y9 + z9i + y8ex7 + y9 + z9j + z8ex7 + y9 + z9k C. ?f = 7x6ex7i + 9y8ey9j + 9z8e z9k D. ?f = x7ex7 + y9 + z9i + y9ex7 + y9 + z9j + z9ex7 + y9 + z9k
Set up an integral for the length of the curve.y = 3 cos x, 0 ? x ? ?
A. 
B. 
C. 
D. 
Solve the problem.A 4-ft tall tree casts a shadow 14 feet long. At the same time, a nearby statue casts a shadow 84 feet long. How tall is the statue?
A. 24 ft B. 26 ft C. 12 ft D. 28 ft
Solve the problem.A water tank can be filled in 9 minutes and emptied in 10 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 90 min
B. 
min
C. 
min
D. 
min