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 5.0 and the pH of the water from a second lake is 5.4, 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. 8.43
B. 12.02
C. 0.40
D. 2.51
Answer: C
Mathematics
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Evaluate the integral.
d?
A. 
sin 
? - 
sin 
? + C
B. 
cos 
? + 
cos 
?+ C
C. 
sin 3? + 
sin 7? + C
D. 
sin 
? + 
sin 
? + C
Mathematics
For the piecewise function, find the specified function value.f(x) = {
f(0)
A. -8 B. -1 C. 4 D. -3
Mathematics
Find all solutions in the interval 
. Use a calculator on the last step and write all answers to the nearest tenth of a degree.
?
4sin ?- 8 = 5sin ?- 4
?
A. 250.5°, 289.5°
B. 19.5°, 340.5°
C. 70.5°, 340.5°
D. 199.5°, 340.5°
E. 
Mathematics
Factor, using the given factor. Assume all variables represent positive real numbers.7k-2 + k-4; k-4
A. k-4(7k3 + 1) B. k-4(7k-2 + 1) C. k-4(7k2 + 1) D. 7 k-4(k2 + 1)
Mathematics