Use the substitution formula to evaluate the integral.
A. - 
B. 
C. - 
D. - 
Answer: D
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Solve the problem.If x is the hydrogen ion concentration of a sample of water, then the pH of that water sample is 
If the pH of the water from one lake is 4.9 and the pH of the water from a second lake is 6.8, how many times greater is the hydrogen ion concentration of the second lake than the hydrogen ion concentration of the first lake? Round your answer to the nearest hundredth.
A. 5.26 B. 24.42 C. 0.01 D. 79.43
Find the equation of a circle satisfying the given conditions.Center: (-9, 0); radius: 11
A. (x - 9)2 + y2 = 121 B. (x + 9)2 + y2 = 121 C. x2 + (y - 9)2 = 11 D. x2 + (y + 9)2 = 11
E ( X )
The probability density function of X is 
Compute the following quantity.
Polar coordinates of a point are given. Find the rectangular coordinates of the point.(-7, 120°)
A. 
B. 
C. 
D. 