Answer: To solve this problem, we will use the formula d = a2 - a1, where d is the common difference and a1 and a2 are two consecutive terms in the sequence.
Step 1: Identify two consecutive terms in the sequence.
In this case, the two consecutive terms are 13 and 18.
Step 2: Substitute the two consecutive terms into the formula d = a2 - a1.
d = 18 - 13
Step 3: Simplify the equation to calculate the common difference.
d = 5
Therefore, the common difference of the arithmetic sequence 13, 18, 23, 28,... is 5.
Explanation: