Considering the sequences given, the first number that appears in both sequences is given by: 45.
The rule is multiply by 3 starting from 5, hence the numbers are:
(5, 15, 45, 135, ...).
The rule is add 9 starting from 18, hence the numbers are:
(18, 27, 36, 45, ...).
45 is the first number that appeared in both sequences.
More can be learned about sequences at https://brainly.com/question/6561461
#SPJ1