Solve the equations by finding the exact solution.
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A. 
B. 
C. 
D. 
E. 
Answer: A
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Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where H+ represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. 1 B. -13 C. -1 D. 13
Find parametric equations for the line described below.The line through the point P(-5, 2, 3) parallel to the vector 
A. x = -8t + 5, y =6t - 2, z = -3t - 3 B. x = 8t + 5, y = 6t - 2, z = -3t - 3 C. x = -8t - 5, y = 6t + 2, z = -3t + 3 D. x = 8t - 5, y = 6t + 2, z = -3t + 3
Write out the first five terms of the sequence.an = n2 - n
A. 0, 2, 6, 12, 20 B. 2, 6, 12, 20, 30 C. 0, 3, 8, 15, 24 D. 1, 4, 9, 16, 25
Simplify the radical.
A. 10.645 B. 6 C. 36 D. not a real number