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## Answers

An=a1+(n-1)d
-18=7+(n-1)-5
-18=7+(-5n+5)
-18-7-5=-5n
-30=-5n
Divide each by -5.
The answer is 6=n.

= a₁ + (n-1) (d)

d = a₂ - a₁

d = 2 - 7

**d = -5**

a₁ = 7

an = -18

n = ?

Solution:

-18 = 7 + (n-1) (-5)

-18 = 7 -5n + 5

-18 = -5n + 12

5n = 12 + 18

5n/n = 30/5

**n = 6**

**ANSWER: -18 is the 6th term of the given sequence.**