What is 10

What is the 5th term, if the 8th term is 80 and common ratio r =1/2?

Correct answer:

a5 =  640

Step-by-step explanation:

a8=80 r=1/2=12=0.5  a5=a8⋅ r5−8=80⋅ 0.55−8=640

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