Use a half-angle formula to find the exact value of the expression.cos 112.5°
A. - 
B. 
C. - 
D. - 
Answer: D
Mathematics
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Decide whether the statement makes sense. Explain your reasoning.I drove really far, almost 200 kilometers per hour.
What will be an ideal response?
Mathematics
Use polar coordinates to find the limit of the function as (x, y) approaches (0, 0).f(x, y) = 
A. 0 B. -1 C. ? D. 1
Mathematics
Provide an appropriate response.Add: 813 + 502 + 307
A. 1,602 B. 1,622 C. 1,612 D. 9,388 E. none of the above
Mathematics
Change the exponential expression to an equivalent expression involving a logarithm.52 = 25
A. log225 = 5 B. log525 = 2 C. log255 = 2 D. log52 = 25
Mathematics