Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule. A(n)=-2+(n-1)(-2.2)

3 answers

A(n)=-2+(n-1)(-2.2)
= -2 - 2.2n + 2.2
= .2 - 2.2n

since term numbers are labeled with whole numbers, n ≥ 1
and the first term is -2
and the common difference is -2.2

the fourth term = a + 3d = -2 + 3(-2.2) = -8.6
then tenth term = .....
what, you can't plug in values?

A(1) = -2+(1-1)(-2.2) = -2
A(2) = -2+(2-1)(-2.2)
and so on

hint. Just keep subtracting 2.2 to get the next term.
3.
Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule.

A(n) = –3 + (n – 1)(–2.2)


–2.2, –11.8, –19.8


–3, –9.6, –22.8


–3, –11.8, –25


0, –6.6, –19.8

The answer is either letter A, letter B, or letter C