Find n for the given value of an in the arithmetic sequence.an = -438
; 801
, 780
, 759
, . . .
A. n = 60
B. n = 56
C. n = 59
D. n = 57
Answer: A
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A. 1
B. 5
C. 
D. 
e
Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them.x - z = 2y + z = 2x + z = 4
A. x = 3, y = 1, z = 1 B. x = 6, y = 2, z = 2 C. x = 1, y = 3, z = - 1 D. x = 2, y = 2, z = 0
Write a formula for the nth term of the arithmetic sequence. Use the formula to find the indicated term of the sequence.a = 6, d = -2;
Find a16.
A. an = 8 - 2n, a16 = -12 B. an = 6 - 2n, a16 = -24 C. an = 8 - 2n, a16 = -24 D. an = 8 + 2n, a16 = -24
Solve the problem.Find the sum of the infinite series 1 + 9r + 4r2 + 9r3 + r4 + 9r5 + 4r6 + 9a7 + r8 ... for those values of r for which it converges.
A. 
B. 
C. 
D. 