1. let an=4n find the sum of the first 5 terms.

How would you do this?

2. a1=3; an+1=3an+18. Find a6
How would you do this?

3. You start you 30 year career at a salary of $50,000 and receive yearly raises of $1,000. How much money will you have earned, in total, over the 30 years?

1 answer

these are all just arithmetic sequences.

An = a + (n-1)d
Sn = n/2 (2a + (n-1)d)

see what this gives you