Please help me with this problem

Work Shown:

The rule is to start with the first term (a1 = 3), then double that and subtract off 1 to get the next term.

Keep doing the "double the value and subtract 1" process to generate as many terms as you want.

a1 = first term = 3

a2 = second term

a2 = 2*a1 - 1   double the previous term, subtract 1

a2 = 2*3 - 1

a2 = 6 - 1

a2 = 5

The second term is 5

a3 = third term

a3 = 2*a2 - 1

a3 = 2*5 - 1

a3 = 10 - 1

a3 = 9

The third term is 9

a4 = fourth term

a4 = 2*a3 - 1

a4 = 2*9 - 1

a4 = 18 - 1

a4 = 17

The fourth term is 17

The first four terms of this recursive sequence is: 3, 5, 9, 17

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

the answer to the expression is 83