1. Which formula is used to determine the nth term a, of an arithmetic sequence whose first term is a, and whose common difference is d? A. an= a1 - (n+1)d B. an = a1 - (n-1)d C. an = a1 + (n-1)d D. an = a1 + (n + 1)d
2. What is the common difference of the sequence 7,4,1,-2,-5?
A. 7 B. 5 C. 3 D. -3
3. What is the 7th term of the arithmetic sequence 4,1,-2,-5,...?
A. -14 B. -13 C. -12 D. -11
4. What is the nth term an of the arithmetic sequence 7,9,11,13,...?
A. an=2 + 5n B. an= 5 - 2n C. an= 2n + 5 D. an= 2 - 5n
5. If three arithmetic means are inserted between 2 and 22, what are they?
A. 5,10,15 B. 6,11,16 C. 7,12,17 D. 8,13,18
6. If five arithmetic means are inserted between -15 and 3, find the third arithmetic mean.
