5

 
Problem Statement

{30,31,32}
{5,7,11}
{1}
round((3*7+4)/3,3)
31*(31+1)/2
31*(31+1)*(2*31+1)/6
round(7*496+(4/3)*10416-8.333,3)

Evaluate the sum.

 
Step 1

Question Sequence

Question

Use linearity of the summation to expand .

A.
B.
C.
D.

Correct.
Incorrect.

 
Step 2

In order to use the formulas, the index, j, must begin at j = 1.

Question Sequence

Question

Rewrite and with j starting at j = 1.

Correct.
Incorrect.

Correct.
Incorrect.

 
Step 3

Question Sequence

Question

Substitute appropriately from step 2 to write the summation with index j =1. Round your answer to three decimal places.

Correct.
Incorrect.

 
Step 4

Recall the formulas and .

Question Sequence

Question

Using these formulas, evaluate . Round your answer to three decimal places.

Correct.
Incorrect.