Solve for the specified variable.
- 
+ 
= 1 for x
A. x = 
B. y = 
C. x = 
D. z = 
Answer: C
Mathematics
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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Mathematics
At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of 0.9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are:More than 15.2 seconds
A. 34% B. 50% C. 68% D. 48%
Mathematics
Write the fraction as a decimal.
A. 0.3 B. 0.0003 C. 0.03 D. 0.003
Mathematics
Solve the problem.If k = 
and k2 - 3k = 18, find x.
A. {
, 
}
B. {
, 
}
C. {
, 
}
D. {6, 
}
Mathematics