Evaluate the sum. $$\sum _ { k = 2 } ^ { 9 } 4 k$$
A) 2
B) 176
C) 352
D) 9
E) none of these

Name: Evaluate the sum. \[\sum _ { k = 2 } ^ { 9 } 4 k\] A) 2 B) 176 C) 352 D) 9 E) none of these
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Question

Quizplus · Accepted Answer

The sum can be calculated directly by adding the terms from $k = 2$ to $k = 9$, each multiplied by 4: $4(2) + 4(3) + 4(4) + 4(5) + 4(6) + 4(7) + 4(8) + 4(9) = 8 + 12 + 16 + 20 + 24 + 28 + 32 + 36 = 176$.

Evaluate the Sum ∑k=294k\sum _ { k = 2 } ^ { 9 } 4 kk=2∑9​4k

Evaluate the Sum $\sum _ { k = 2 } ^ { 9 } 4 k$