Question

Explicit formula? Question is attached

Answer 1

it's getting smaller and smaller by 5

so the formula is an = -5n + b

substitute the first term to find b
n = 1, a_1 = 7

7 = -5 + b
b = 12

an = -5+ 12

Answer 2

@nphuongsun93...please give the person asking the question the chance to do some of the work. Otherwise there's no incentive to learn.

Answer 3

Yeah I really appreciate the formula but I would rather do it myself haha thank you though

Answer 4

sorry, got lazy sometimes ;_;

Answer 5

Hahaha no problem :)

Answer 6

Anyway, in general, if you have an equation a(n) = hn + k, the k is the starting number, and the h is the amount that the sequence goes up or down by each time.

Answer 7

Thanks! :)