Solve the problem.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose 
is 3.05 × 10-9 moles per liter. (Round to the nearest tenth.)
A. 6.4
B. 7.3
C. 8.5
D. 10.1
Answer: C
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Find the curvature of the curve r(t).r(t) = (7 + ln(sec t))i + (4 + t)k, -?/2 < t < ?/2
A. ? = -cos t B. ? = sin t C. ? = cos t D. ? = 1 - cos t
Assume that f is an even function, g is an odd function, and both f and g are defined on the entire real line. State whether the combination of functions (where defined) is even or odd.f ? f
A. Even B. Odd
Evaluate.52
A. -25 B. -10 C. 10 D. 25
Find the center, transverse axis, vertices, foci, and asymptotes of the hyperbola.49y2 - 64x2 = 3136
A. center at (0, 0)
transverse axis is y-axis
vertices: (0, -8), (0, 8)
foci: (- 
, 0) , (
, 0)
asymptotes of y = - 
and y = 
B. center at (0, 0)
transverse axis is y-axis
vertices at (0, -8) and (0, 8)
foci at (0, - 
) and (0, 
)
asymptotes of y = - 
and y = 
C. center at (0, 0)
transverse axis is x-axis
vertices: (-7, 0), (7, 0)
foci: (- 
, 0) , (
, 0)
asymptotes of y = - 
and y = 
D. center at (0, 0)
transverse axis is x-axis
vertices: (-8, 0), (8, 0)
foci: (-7, 0), (7, 0)
asymptotes of y = - 
and y = 