The pH of a solution is given by the formula 
, where 
is the concentration of hydrogen ions in moles per liter in the solution. Use this formula to solve the problem.The pH value of a substance is 5.42. Find the hydrogen-ion concentration for this substance.
A. 263,026.8
B. 0.0000038
C. 1.7
D. 0.2
Answer: B
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Simplify the given expression. Expansion of any term is not necessary; proper recognition of the form of the expression leads to the proper result.
A. 6 tan 6x B. 3 tan 6x C. 3 tan 3x D. tan 6x
Solve the variation problem.The distance it takes to stop a car varies directly as the square of the speed of the car. If it takes 112 feet for a car traveling at 40 miles per hour to stop, what distance is required for a speed of 
per hour?
A. 308.05 feet B. 295.75 feet C. 296.09 feet D. 253.5 feet
What does the circuit symbol in the figure mean?
?
?
A. switch B. battery (or power source) C. light
Write the equation either in the form (y - k)2 = a(x - h) or (x - h)2 = a(y - k).49y2 + 14y - 41 = 5x
A. 
2 = 
B. 
2 = 
C. 
2 = 
D. 
2 = 
