Express the sum using summation notation. Use a lower limit of summation, not necessarily 1, and k for the index of summation.a + ar + ar2 + . . . + ar14
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Find 
.y = cos-1
A. - 
B. 
C. 
D. 
Mathematics
Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula 
, as needed.Find [H3O+] if the pH = 5.4.
A. 2.5 × 10-5 B. 4.0 × 10-5 C. 2.5 × 10-6 D. 4.0 × 10-6
Mathematics
Convert the angle in degrees to radians. Express answer as a multiple of ?.- 160°
A. - 
? radians
B. - 
radians
C. - 
radians
D. - 
radians
Mathematics
Graph the solution set of the following system of inequalities and find the coordinates of points where any lines intersect.
A. 
B. 
C. 
D. 
Mathematics