Understanding and applying arithmetic series

• 63

• 15

• 36

• 62

Find the sum: $\sum_{x=1}^{20}2x+3$  

• 24

• 480

• 33

• 660

Find the sum of the series  $\sum_{k=0}^4k^3$  

• 100

• 28

• 10

• I need tutoring

Find the sum of the finite arithmetic series

10 + 20 + 30 + ... + 120

• 840

• 620

• 780

• 1283

• 149
• 11,200
• 5,600
• 140

Find the sum: $\sum_{r=1}^{30}-n+2$  

• -435

• -40.5

• -405

• -13.5

Evaluate the arithmetic series described:
a₁ = 5, a_n = 145, Find S₁₅

• 1125
• 2255
• 2250
• 2258

Find S₁₄ for the arithmetic sequence.

• 959

• 36

• 497

• 185

The 6th partial sum of the series 2 + 6 + 10 + 14 + ... in sigma notation is

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Find the sum of the first 20 terms of the arithmetic sequence $14+3-8+...$  

• -1810

• -195

• 195

• 1810