Question

Find an equation for the nth term of the arithmetic sequence.

-3, -5, -7, -9, ..

A) an = -3 - 2
B) an = -3 + -2(n)
C) an = -3 + -2(n + 1)
D) an = -3 + -2(n - 1)

Answer 1

@Hero @Nnesha @mathmale

Answer 2

@Jaynator495

Answer 3

The most basic function for the nth term of a general arith. sequence is

l = a + (n-1)d, where l= last term, a= first term, n= numer of terms, and d=spacing between terms, or the jump from one term to the next.

Adapt this formula to the given problem, please.

Answer 4

so it would be B? @mathmale

Answer 5

Now that you have made a tentative choice, you need to check your answer by trying it out. If you let a=-3, does your formula correctly predict that your second term is -5? If not, then check out the other possibilities.