these are all just arithmetic sequences.
An = a + (n-1)d
Sn = n/2 (2a + (n-1)d)
see what this gives you
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
1 answer