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 + . . . + ar11
A. 
B. 
C. 
D. 
Answer: B
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Write one or more inequalities that describe the set of points.The closed region bounded by the spheres of radius 9 and 10, both centered at the origin, and the planes 
and 
A. 81 ? x2 + y2 + z2 ? 100 and 1 ? x ? 9 B. 9 ? x2 + y2 + z2 ? 10 and x = 1 and x = 9 C. 9 < x2 + y2 + z2 < 10 and x = 1 and x = 9 D. 81 < x2 + y2 + z2 < 100 and 1 < x < 9
Find the average value of the function f over the given region.f(x, y) = 6x + 3y over the rectangle 0 ? x ? 5, 0 ? y ? 9.
A. 
B. 15
C. 
D. 
Evaluate the expression for the given value of the variable or variables.-4x2 + 5x - 1;
x = -4
A. 43 B. -85 C. 83 D. -45
Write the first four terms of the sequence.an = 
A. a1 = 1, a2 = 
, a3 = 
, a4 = 
B. a1 = 
, a2 = 
, a3 = 
, a4 = 
C. a1 = 
, a2 = 
, a3 = 
, a4 = 
D. a1 = 
, a2 = 
, a3 = 
, a4 = 