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.20, 13 , 6, -1, . . .
A. an = 7n - 27; a20 = 113
B. an = 7n - 20; a20 = 120
C. an = -7n + 20; a20 = -120
D. an = -7n + 27; a20 = -113
Answer: D
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A. 
B. 
C. 
D. 
Solve the problem.A ladder is resting against a wall. The top of the ladder touches the wall at a height of 12 ft. Find the length of the ladder if the length is 4 ft more than its distance from the wall.
A. 12 ft B. 20 ft C. 24 ft D. 16 ft
Rewrite the sum using sigma notation.9 + 27 + 81 + 243 + 729
A. 
B. 
C. 
D. 
Solve the problem.The number of VHS movie rentals has declined since the year 2000 due to the popularity of DVDs, as the following table shows. Make a scatterplot of the data and determine if the data would be better modeled by a linear model or by an exponential model.
A. Exponential
B. Linear
C. Exponential
D. Linear