Integrate the function.
A. 
sin x - 
sin 3x + C
B. - 
cos3 x + C
C. 
cos3 x + C
D. 
sin3 x + C
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
Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 
Solve the problem.A cab company charges a base rate of $1.50 plus 15 cents per minute. Let y be the cost in dollars of using the cab for x minutes. Find the slope-intercept form of the equation.
A. y = 1.50x + 0.15 B. y = 1.50x - 0.15 C. y = 0.15x - 1.50 D. y = 0.15x + 1.50
Find the length of the arc on the circle of radius r meters intercepted by a central angle ?. Round your answer to three decimal places.r = 9, ? = 
radians
A. 8.594 m B. 9.425 m C. 18.85 m D. 1.047 m