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

Mathematics

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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

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What does the circuit symbol in the figure mean? ? ?

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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 = 
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C. 2 = 
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