Find an equation for the graph.
A. y = 4 cos 
B. y = -4 cos (2x)
C. y = 4 cos (2x)
D. y = 4 sin (2x)
Answer: C
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Solve the problem.Use Newton's Law of Cooling to find the temperature in the following case. A loaf of bread is removed from an oven at 
and cooled in a room whose temperature is 
. If the bread cools to 
in 20 minutes, how much longer will it take the bread to cool to 
A. ? 40 minutes B. ? 21 minutes C. ? 20 minutes D. ? 28 minutes
Find the limit, if it exists.
A. 1/2 B. 1/4 C. Does not exist D. 0
Let U = {q, r, s, t, u, v, w, x, y, z}, A = {q, s, u, w, y}, B = {q, s, y, z}, and C = {v, w, x, y, z}. List the elements in the following set.
? 
A. {q, s, u, v, w, x, y, z} B. {r, t} C. {q, r, s, t, u, v, x, z} D. {w, y}
A deck of cards contains 52 cards. These cards consist of four suits - hearts, spades, clubs, and diamonds. Each suit contains one of each of the following: 2, 3, 4, 5, 6, 7, 8, 9, 10, jack, queen, king, and ace. Assume that one card is selected at random from a well-shuffled deck of cards.Find the probability that the card is a red card.
A. 
B. 
C. 
D. 