Use an appropriate identity to find the exact value of the expression.cos (255°)
A. 
B. - 
C. 
(
- 1)
D. - 
(
- 1)
Answer: B
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Solve the problem.The hydrogen ion concentration of a substance is about 8.7 × 10-7 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. 6.5 B. -7.9 C. 6.1 D. 7.9
Sketch the graph of f(x). Determine the domain, range, and the equation of the horizontal asymptote of the function.f(x) = ex - 5
A. Domain: (-?, ?), range: (-5, ?)
Horizontal asymptote: y = -5
B. Domain: (-?, ?), range: (5, ?)
Horizontal asymptote: y = 5
C. Domain: (-?, ?), range: (-?, 5)
Horizontal asymptote: y = 5
D. Domain: (-?, ?), range: (-5, ?)
Horizontal asymptote: y = -5
Solve the problem.If there are x teams in a sports league and all the teams play each other twice, a total of N(x) games are played, where N(x) = x2 - x. A soccer league has 10 teams, each of which plays the others twice. If the league pays $46 per game for the field and officials, how much will it cost to play the entire schedule?
A. $5060 B. $4600 C. $4232 D. $4140
Find the domain of the composite function f ? g.f(x) = 
; g(x) = 
A. {x 
B. {x 
C. {x 
D. {x 