Respuesta :

Solution

[tex]\begin{gathered} T_n=ar^{n-1} \\ \\ T_4=10(\frac{1}{2})^{4-1} \\ \\ T_4=10(\frac{1}{8}) \\ \\ T_4=\frac{5}{4} \\ \\ T_4=1.25 \end{gathered}[/tex]

The answer is

[tex]1.25[/tex]