Question

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

Answer 1

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