Determine whether the sequence 5,15,45,135,... is geometric and if it is, what is the common ratio

Determine whether the sequence 5,15,45,135,... is geometric and if it is, what is the common ratio
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Jase Powell
Sequence : 5,15,45,135,.......
${a}_{1}=5,{a}_{2}=15,{a}_{3}=45,{a}_{4}=135,.......$
$\frac{{a}_{2}}{{a}_{1}}=\frac{15}{5}=3,\frac{{a}_{3}}{{a}_{2}}=\frac{45}{15}=3,\frac{{a}_{4}}{{a}_{3}}=\frac{135}{45}=3,.....$
In this sequence the ratio of each term and the previous term is
constant , so it is geometric sequnce and constant is 3.
Common ratio is 3