Arithmetic Sequence and Series

Find a₂₆ in the arithmetic sequence: -15, -35, -55, -75, ...

• -515
• -490
• -535
• 460

Tags

CCSS.HSF.BF.A.2

Evaluate:  $\sum_{k=1}^6\left(2k-1\right)$  

• 28

• 18

• 36

• 21

 $Find\ S_{11}\ for\ 10+5+0+-5+-10$  

• 0

• -165

• -40

• 275

Find the 20th term in the arithmetic sequence: given  $a_8=19\ \ \ \ and\ \ \ \ \ \ a_{15}=68\ \$  

• 476

• -30

• 87

• 103

Find the missing terms: 31, ___, ___, ___, 79

• 58, 85, 112

• 43, 55, 67

• 40, 49, 58

• 41, 51, 61