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. 8
B. -8
C. 6
D. -6
Answer: C
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Solve the problem.A satellite dish is in the shape of a parabolic surface. Signals coming from a satellite strike the surface of the dish and are reflected to the focus, where the receiver is located. The satellite dish shown has a diameter of 16 feet and a depth of 7 feet. The parabola is positioned in a rectangular coordinate system with its vertex at the origin. Write an equation in the form of 
for the parabola used to shape the dish. 
A. y = 
x2
B. y = 
x2
C. y = 
x2
D. y = 
x2
Simplify the rational expression.
A. 
B. 
C. 
D. 8 - x
Use the distributive property to rewrite the expression.49(39 + 44)
A. 49 ? 39 + 49 ? 44 B. 49 + 39 + 44 C. 49 ? 39 + 44 D. 49 ? 83
Evaluate or determine that the limit does not exist for each of the limits 
and 
for the given function f and number d.f(x) = 
; d = 1
A. (a) -3 (b) -1 (c) -4 B. (a) -3 (b) -1 (c) Does not exist C. (a) -1 (b) -3 (c) -4 D. (a) -1 (b) -3 (c) Does not exist