Respuesta :

[tex]\bf n^{th}\textit{ term of a geometric sequence}\\\\ a_n=a_1\cdot r^{n-1}\qquad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ r=\textit{common ratio}\\ ----------\\ a_1=10\\ r=0.5\\ n=4 \end{cases}\implies a_4=10\cdot 0.5^{4-1}[/tex]

Answer:

1.25

Step-by-step explanation:

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