Find the measure of each marked angle.
A. 45° and 135°
B. 60° and 120°
C. 45° and 55°
D. 90° and 270°
Answer: A
Mathematics
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Use half-angle identities to find the exact value of the expression.sin (-112.5°)
A. - 
B. 
C. 
D. - 
Mathematics
Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for x = 200?
A. $309.52 B. $487.50 C. $325.12 D. $200.91
Mathematics
Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = x2 - 10x + 9
A. Increasing on (5, ?); decreasing on (-?, 5) B. Increasing on (- 5, ?); decreasing on (-?, -5) C. Increasing on (-?, - 5); decreasing on (-5, ?) D. Increasing on (-?, 5); decreasing on (5, ?)
Mathematics
Solve the equation.
A. 
B. 
C. 
D. 
E. 
Mathematics