Solve.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 hydrogen ion concentration, 
, is 
moles per liter. (Round to the
nearest tenth.)
A. 8.5
B. 7.3
C. 10.1
D. 6.4
Answer: A
Mathematics
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Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: cone x2 + y2 - z2 = 0 between z = 1 and z = 2Density: constant
A. 
B. 
C. 
D. 
Mathematics
Suppose that y is directly proportional to x. Use the given information to find the constant of proportionality k. Then use y = kx to find y for the given value of x.y = 8.5 when x = 17;
Find y given x = 6.
A. k = 144.5; y = 
B. k = 1.5; y = 2.4
C. k = 0.5; y = 3
D. k = 0.5; y = 2.4
Mathematics
Given 
, find 
.
?
A. -24 B. 66 C. 24 D. 36 E. -36
Mathematics
Simplify.
A. 
B. 
C. 
D. 
Mathematics