Choose the best estimate from the list.6
+ 9
is approximately 15, 15
, 15
, 16.
A. 15
B. 15
C. 16
D. 15
Answer: A
Mathematics
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Find the center of the ellipse.16x2 + 32x + 25y2 - 200y + 16 = 0
A. (-6, 4) B. (4, -6) C. (4, -1) D. (-1, 4)
Mathematics
Estimate the magnitude of the error involved in using the sum of the first four terms to approximate the sum of the entire series.
A. 
B. 8.50 × 10-6
C. 5.95 × 10-5
D. 4.16 × 10-4
Mathematics
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
Mathematics
Simplify the expression.
A. 2610 B. 56 C. 106 D. 166
Mathematics