Use a double-angle identity to find the exact value of the expression.2 cos2 22.5° - 1
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Provide an appropriate response.Without calculating, justify the statement 2 ? 18 ? 3 ? 17.
What will be an ideal response?
Mathematics
Solve the problem.The dimensions of a rectangular yard are 26 feet by 102 feet. What is its perimeter?
A. 154 feet B. 256 feet C. 128 feet D. 2652 feet
Mathematics
Find fraction notation for the ratio. You need not simplify.Of a family's $827 weekly income, $83 usually goes toward groceries. What is the ratio of the amount spent on groceries to weekly income?
A. 
B. 
C. 
D. 
Mathematics
Write the standard form of the equation of the circle described.Center (0, 0), r = 4
A. x2 + y2 = 4 B. x2 + y2 = 16 C. (x - 4)2 + (y - 4)2 = 4 D. (x - 4)2 + (y - 4)2 = 16
Mathematics