Solve the problem.How many 2-letter codes can be formed using the letters A, B, C, D, E, F, G, H, and I. Repeated letters are allowed.
A. 72
B. 36
C. 81
D. 512
Answer: C
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Solve the problem.Find the sum of the infinite series 1 + 6r + 3r2 + 6r3 + r4 + 6r5 + 3r6 + 6a7 + r8 . . . for those values of r for which it converges.
A. 
B. 
C. 
D. 
Write an expression that illustrates the intermediate steps required to mentally perform the specified computation using adjustment.4768 ÷ 8
A. (4900 - 4768) ÷ 8 B. (4700 + 4768) ÷ 8 C. (4900 - 100) ÷ 8 D. (4800 - 32) ÷ 8
Determine the degree of the polynomial.7x2y + 5xy5 + x3y4 + 5x4
A. 7 B. 8 C. 1 D. 3
Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20, the 20th term of the sequence.a1 = - 
, d = 
A. an = 
n - 
; a20 = 
B. an = - 
n + 
; a20 = - 
C. an = - 
n + 
; a20 = - 
D. an = 
n - 
; a20 = 