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. 7.3
B. 8.5
C. 10.1
D. 6.4
Answer: B
Mathematics
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Perform the operation. Write the answer as a fraction in lowest terms.
+ 
A. 
B. 
C. 
D. 
Mathematics
Convert to logarithmic form.
-3 = 
A. log-3
= 
B. log3
= 
C. log8/3
= -3
D. 
= 
Mathematics
Identify the points in the graph for the ordered pairs. 
(-5, -4), (0, -3)
A. I and J B. A and G C. A and J D. G and I
Mathematics
Solve the system by using the inverse of the coefficient matrix. 2x1 + 6x2 = 2 2x1 - x2 = -5
A. (1, -2) B. (2, -1) C. (-2, 1) D. (-1, 2)
Mathematics