Solve the problem.The hydrogen ion concentration of a substance
is about 5.2 x 10-7 moles per liter. Find the pH. Round to the nearest tenth. Use the formula pH = -log [H+].
A. 6.6
B. -7.7
C. 6.3
D. 7.7
Answer: C
Mathematics
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Perform the operation indicated. Simplify.
- 
A. 
B. 
C. 
D. 
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Simplify the expression.5a - 2a + 3
A. 3a + 3 B. -3a + 3 C. 7a + 3 D. 6a
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Find the sum of the finite geometric series using a formula.
+ 
+ 
+ 
+ 
A. 
B. 
C. 
D. 
Mathematics
Find the indicated coefficient or term.The 12th term in the expansion of (x - 2y)13
A. 79,872x11y2 B. -159,744x2y11 C. 79,872x2y12 D. -159,744x11y2
Mathematics