Arithmetic Sequence

What is the common difference of the sequence 2, -1, -4, -7,...?

• -3

• -1

• -2

• 3

What is the 67^th term of the following arithmetic sequence.

13, 22, 31, 40, ...

• -445

• 67

• 625

• 607

Find the explicit formula:
-23, -16, -9, -2, ...

• a_n = -23 + 7(n -1)

• a_n = -23 - 7(n -1)

• a_n = 7 - 23(n -1)

• a_n = 7 + 23(n -1)

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

• 100

• 1000

• 50

• -98

• Arithmetic

• Geometric

Answer explanation

Percentages are almost always Geometric.

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

• 1220

• 610

• 600

• 612

Find the common difference: -18, -23, -28, -33, ...

• d = -5

• d = 5

• d = -3

• d = 3

Find the next three terms in the arithmetic sequence: -3, -8, -13, -18, ...

• -20, -24, -28

• -21, -25, -29

• -23, -28, -33

• -24, -29, -32

Find the next three terms in the arithmetic sequence: 25, 34, 43, 52, ...

• 63, 72, 81

• 79, 88, 97

• 70, 79, 88

• 61, 70, 79

Find 26th term in the arithmetic sequence: -15, -35, -55, -75, ...

• -515

• -490

• -535

• 460