Solve the equation.
+ 
= - 
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Use a half-angle formula to find the exact value of the expression.cos 
A. 
B. - 
C. - 
D. 
Mathematics
Simplify the expression.
A. 
B. 
C. 0
D. 
Mathematics
Solve the problem.What is the probability that the arrow will land on 3 or 5?
A. 
B. 
C. 
D. 1
Mathematics
Solve.It is estimated that y, the number of items of a particular commodity (in millions) sold in the United States in year x, where x represents the number of years since 1990, is given by the formula 
That is, 
represents 1990, 
represents 1991, and so on. According to the formula, how many items sold in 2000?
A. 20.72 millions B. 51.20 millions C. 19.16 millions D. 3.56 millions
Mathematics