Question

ME AJUDEMMMMMMMMMMMMM
A razão da PG que tem o primeiro termo igual a 100 e o quarto termo igual a 0,8, vale:

Answer 1

$a_n=a_1*q^n^-^1\\\\ 0,8=100*q^3\\\\ q^3=\frac{0,8}{100}\\\\ q^3=0,008\\\\ q^3=8.10^-^3\\\\ q= \sqrt[3]{8.10^-^3}\\\\ q=2.10^-^1\\\\ \boxed{q=0,2}$