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:

$$\begin{gathered} a_8=80 \\ r=1\mathrm{/}2={\displaystyle \frac{1}{2}}=0.5 \\ {a}_5=a_8\cdot r^{5-8}=80\cdot 0.5^{5-8}=640 \end{gathered}$$

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