Question

????

Answer 1

is this right

Answer 2

@JoannaBlackwelder

Answer 3

Yep, looks good. :-)

Answer 4

can you help with another?

Answer 5

@JoannaBlackwelder

Answer 6

Do it the way I showed you earlier...
\[\Large a_n = 2 a_{n-1}\]so...
\[\Large a_2 = 2 a_{1}\]
\[\Large a_3 = 2 a_{2}\]
\[\Large a_4 = 2 a_{3}\]