Question

Please help ASAP!!!

Find tn for the following geomertic sequance: -60,30,-15 and then find t20.

Answer 1

`t_1=-60`

`t_2=-\frac12*(-60)=30`

`t_3=-\frac12*30=\left(-\frac12\right)^2*(-60)=-15`

In general, you have


`t_n=\left(-\frac12\right)^(n-1)*(-60)`

and so


`t_(20)=\left(-\frac12\right)^(19)*(-60)=(15)/(131072)\approx0.0001144`