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. 10.1
B. 6.4
C. 7.3
D. 8.5
Answer: D
Mathematics
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Find y".y = (
- 4)-3
A. - 
(
- 4)-4
B. 6(
- 4)-5
C. - 
(
- 4)-5
D. 
(
- 4)-5
Mathematics
Fill in the blank with one of the words or phrases listed below.
A system of equations that has no solution is called a(n) 
system.
A. consistent B. independent C. inconsistent D. dependent
Mathematics
A cable railway had a 12-foot-diameter pulley to drive the cable (see the figure). In order to keep the cable cars moving at a linear velocity of 9 miles per hour, how fast would the pulley need to turn (in revolutions per minute)? (1 mi = 5,280 ft)
?
?
A. 23.2 rpm B. 24.5 rpm C. 15.3 rpm D. 28.1 rpm E. 21.0 rpm
Mathematics
Solve the equation.
= -11 + 5
A. -66 B. -36 C. -6 D. -96
Mathematics