Question

__________________
$- - - - - - - - - - - - - - - - - - - -$

Answer 1

$y_{5}= frac{3}{4}\\\q=-frac{1}{4}\\y_{5}= y_{1}* q^{4}\\y_{1}= frac{y_{5}} {q^{4}}= frac{3}{4}:(- frac{1}{4}) ^{4}= frac{3}{4}* 4^{4}=3* 4^{3}=192$