Question

Find the 66th term of the arithmetic sequence -28,-45, -62,-

Answer 1

-1133

Explanation:

-17(66-1)+(-28)

-17(65)+(-28)

type in calculator or desmos

-1133

Answer 2

-1133

Explanation:

Formula for nth term

• aₙ = a + (n - 1)d

Finding d

• d = -45 - (-28)
• d = -45 + 28
• d = -17

Solving for a₆₆

• a₆₆ = -28 + 65(-17)
• a₆₆ = -28 - 1105
• a₆₆ = -1133