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. 3
B. -11
C. -3
D. 11
Answer: A
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?The circumference of the Earth is approximately 24,884.5 miles, using 3.14 for ?. What is the diameter of the Earth? ?
A.
?7,925miles
B.
?3,962.5miles
C.
?
miles
D.
?
miles
E.
?Cannot be determined.
Solve the problem.The shape and density of a thin shell are indicated below. Find the moment of inertia about the z-axis.Shell: upper hemisphere of x2 + y2 + z2 = 9 cut by the plane z = 0Density: ? = 3
A. Iz = 324?
B. Iz = 27?
C. Iz = 
?
D. Iz = 162?
Find all solutions if 
. Verify your answer graphically.
?
?
A. 45°, 135° B. 15°, 75°, 195°, 255°, 280° C. 30°, 60°, 210°, 240° D. 15°, 75°, 195°, 255° E. 30°, 60°, 210°, 240°, 260°
Factor completely. If a polynomial cannot be factored, say it is prime.3x2 + 4x + 12x + 16
A. (x + 4)(3x + 4) B. (3x + 4)(3x + 4) C. prime D. (3x + 4)(4x + 3)