Determine if the following is an identity.cot2x = (csc x - 1)(csc x + 1)
A. Identity
B. Not an identity
Answer: A
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Find the volume of the solid generated by revolving the region bounded by the given lines and curves about the 
. y = 
, y = 0, x = 0, x = 9
A. 486? B. 18? C. 972? D. 324?
Determine algebraically whether the function is even, odd, or neither even nor odd.f(x) = 8x4 - 2x - 5
A. Even B. Odd C. Neither
Solve using Cramer's rule.-4x + 2y - z = -14 x + 2y - 8z = -22 3x + y + z = 19
A. (4, 3, 4) B. (3, 4, 3) C. (5, 1, 4) D. (4, -3, -4)
Solve the problem.Newton's Law of Cooling states that if a body with temperature T1 is placed in surroundings with temperature T0 different from T1, then the body will either cool or warm to temperature T(t) after time t, in minutes, where 
A cup of coffee with temperature 102°F is placed in a freezer with temperature 0°F. After 8 minutes, the temperature of the coffee is 53.8°F. What will its temperature be 19 minutes after it is placed in the freezer? Round your answer to the nearest degree.
A. 19°F B. 22°F C. 17°F D. 21°F