1. The sum of the terms of the arithmetic sequence 1,3,5,7 is.
a.15
b.16
c.17
d.18
2. 7/9+1+11/9+13/9+___ is an.
a. arithmetic series
b. geometric series
c. geometric mean
d. arithmetic mean
3.If n, a¹, and an, are known, then the formula_____ is used to find the sum of n terms.
a.Sn=n/2( a¹+ an)
b.a¹+(n-1)d
c.m= a¹-an/2
d.Sn=2/n(a¹+an)
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Answer:
1. 1 + 3 + 5 + 7 = 16 b.
2. a. Arithmetic series
3. a. Sn=n/2( a¹+ an)
Answer:
1. b
2.c
3. a
Step-by-step explanation:
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