Week 3 - Arithmetic Sequences

1

100

Find the 8th term

−34, −64, −94, −124, ...

-244

200

Find the 22nd term

9, 14, 19, 24, ...

114

300

Find the 75th term

16/4, 13/4, 10/4, 7/4, ...

-206/4

400

Find the 1st term

a₁₂ = 28.6, d = 1.8

8.8

500

Find the 59th term

a₁₈ = 44.3 and a₃₃ = 84.8

155

2

100

Find the 9th term

35, 32, 29, 26, ...

11

200

Find the 17th term

−7, −9, −11, −13, ...

-39

300

Find the 83rd term

1.5, 2.25, 3, 3.75, ...

63

400

Find the 1st term

a₂₁ = −1.4, d = 0.6

-13.4

500

Find the 66th term

a₁₈ = 3362 and a₃₈ = 7362

12962

3

100

Find the 8th term

a₁ = 35, d = 4

63

200

Find the 30th term

a₁ = −100, d = −38

-1202

300

Find the 91st term

a₁ = 4/8, d = 7/8

634/8

400

Find the 1st term

a₁₉ = −9.2, d = 0.9

-25.4

500

SURPRISE!

:)

4

100

Find the sum of the first 5 terms

19, 13, …

35

200

Find the sum of the first 29 terms

-17, -12, ...

1537

300

Find the sum of the first 72 terms

4, 11, …

18180

400

Find the sum of the first 30 terms 

a₇ = -19, a₁₃ = 35

1725

500

Find the sum of the first 25 terms

a₇ = 23, S₂₀ = 670

1025

5

100

Find the sum of the first 6 terms

-9, -1, …

66

200

Find the sum of the first 37 terms

83, 80, ...

1073

300

Find the sum of the first 93 terms

5, 9, ...

17577

400

Find the sum of the first 79 terms 

a₁₅ = 33, a₅₀ = 103

6557

500

Find the sum of the first 31 terms

a₉ = 57 and S₁₈ = 1080 

3069