Use the sum formulas to find the value of the sum that follows.
A) 720
B) 160
C) 435
D) 820
E) 90

Question

Use the sum formulas to find the value of the sum that follows. ​  ​
A) 720 
B) 160 
C) 435 
D) 820 
E) 90

Quizplus · Accepted Answer

Using the sum formula for an arithmetic series:

Sn = n/2 * (a1 + an)

where Sn is the sum of the series, n is the number of terms, a1 is the first term, and an is the nth term.

In this case, we can identify the first term (a1) as 11 and the last term (an) as 110. The number of terms is 10 since the series goes from 11 to 110 in increments of 11.

Plugging these values into the formula:

S10 = 10/2 * (11 + 110) = 820

Therefore, the answer is D, 820.

Use the Sum Formulas to Find the Value of the Sum