### Home > CCA2 > Chapter 2 > Lesson 2.2.2 > Problem2-120

2-120.

Is $−578$ a term in the sequence defined by $t(n)=−5n+7$? Justify your answer.

Substitute $−578$ for $t(n)$.

$−5n+7=−578$

Isolate the variable to solve for $n$. Is $n$ a positive integer?