Solve the problem.The hydrogen ion concentration of a substance is about 4.2 × 10-6 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. 6.6
B. -6.6
C. 5.4
D. 5.7
Answer: C
Mathematics
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Determine if the series converges or diverges. If the series converges, find its sum.
A. converges; 
B. converges; ln 5
C. diverges
D. converges; 
Mathematics
For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (3 sin 
t + 8)i + (3 cos 20t) - 5)j + 12tk; osculating plane at t = 6.5?.
A. 
(y + 5) + 
= 0
B. 
(y - 5) + 
= 0
C. 
(y + 5) + 
= 0
D. 
(x - 8) + 
= 0
Mathematics
Provide an appropriate response.Raise the term to the indicated power: 
3
A. 
B. 
C. 
D. 
Mathematics
Solve or simplify, whichever is appropriate.54y-2 + 1 + 15y-1
A. (y + 9)(y + 6)
B. 
C. {15, -9}
D. {9, 6}
Mathematics