if a1=5 and a2=10 in an arithmetic sequence, what is the value of a4?
A.25/2
B.5/2
C.5
D.15
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if a1=5 and a2=10 in an arithmetic sequence, what is the value of a4?
A.25/2
B.5/2
C.5
D.15
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Answer:
none of the above , its 20
Step-by-step explanation:
arithmetic sequence
a1 = 5
a2 = 10
a3 = 15
a4 = 20
a5 = 25
d=5
geometric sequence
a1 = 5
a2 = 10
a3 = 20
a4 = 40
a5 = 80
r=2