4/8 work

Find the sum of the 1st 20 terms: 2+5+8+......

• 1220

• 610

• 600

• 612

Find the sum of the 1st 100 terms: 100+98+96+......

• 100

• 1000

• 50

• -98

Find the sum: 11 + 15 + 19 + .......+ 83

• 19

• 83

• 893

• 624

Find the sum: 50 + 48 + 46 + ..... + 10

• 630

• 21

• 210

• 1260

Find S_n for the given series:
a₁=22
d=-8
n=21

• 1911
• -1449
• -2436
• -1218

Find the sum of first 30 positive numbers.

• 460

• 465

• 470

• 475

Find the 22nd term of the following sequence:
5, 8, 11, ...

• 14
• 68
• 63
• 71

Create the explicit formula for the sequence:
2, 8, 14, ...
(Hint:  Write your formula and then simplify it.)

• a_n=2+6n
• a_n=-6+6n
• a_n=6n-4
• a_n=4-6n

Find the first term of the given sequence:
a₁₄=68
d=3

• 14
• 20
• 26
• 29

Identify the common difference.
97, 86, 75, 64, ...

• 8
• 11
• -11
• -8