
an is the 'nth' term
a1 is first term
d=common difference (found by doing

)
n=numerical representation of which term
Answer:
a
Step-by-step explanation:
3-5 is -2
Answer: 6r^3 - 15r
Step-by-step explanation:
(3r) (2r^2 - 5)
Distribute.
6r^3 - 15r
Hope this helped.
I think the answer is 61 dont quote me on it im awful at math