Find the exact value of the sum.cos 
+ cos 
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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The temperature T, in degrees Fahrenheit, of a cup of coffee t minutes after it is poured is given by
?
.
?
When does the temperature of the coffee reach 150 degrees? Round your answer to two decimal places if necessary.
?
A. After 15.6 minutes B. After 65.49 minutes C. After 63.54 minutes D. After 20.2 minutes
Mathematics
Graph the function.y = cos 5?x
A. 
B. 
C. 
D. 
Mathematics
Rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero.3-7/9ax-2/3z3
A. 
B. 
C. 
D. 
Mathematics
Find the limit.
a. ?
b. -6
c. -?
d. 5
e. 0
Mathematics