Question

Help please !!!!!!!!!!

Answer 1

`\boxed{a_1=0.5}\\\\\\a_n=4\cdot a_(n-1)\quad|:a_(n-1)\\\\\\(a_n)/(a_(n-1))=4\\\\\\\boxed{r=4}`

so:


`a_n=a_1(r)^((n-1))\\\\\boxed{a_n=0.5\cdot4^((n-1))}`

Answer C.