Find the exact value of the trigonometric expression without the use of a calculator.If sin ? = 
, 
< ? < ? and cos ? = 
, 0 < ? < 
, find the exact value of cos (? - ?).
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve the problem.The amount of Jen's monthly phone bill is normally distributed with a mean of $72 and a standard deviation of $9. What percentage of her phone bills are between $72 and $81?
A. 47.5% B. 34% C. 68% D. 95%
Mathematics
Solve the equation first by clearing the fractions.- 
= y - 
A. - 
B. - 
C. 
D. 
Mathematics
Find an equation for the ellipse described.Vertices at (5, -4) and (5, 8); length of minor axis is 6
A. 
+ 
= 1
B. 
+ 
= 1
C. 
- 
= 1
D. 
+ 
= 1
Mathematics
Solve and graph.-9x - 10 > -10x - 4
A. x ? -14 
B. x < 6 
C. x > 6 
D. x ? -14 
Mathematics