### Home > A2C > Chapter Ch13 > Lesson 13.1.3 > Problem 13-53

13-53.

For the sequence: 7, −2, −11, −20, … Homework Help ✎

Find

*t*(40), the 40^{th}term.Find

*S*(40), the sum of the first 40 terms.

*t*(*n*) = −9*n* + 16

*t*(40) = −344

Use the summation formula: