Item: tCommonDifference1c
Stem:
Find the common difference for the following arithmetic sequence:
4, 24, 44, 64, 84, . . .
Inputs:
- Enter your answer here:
Key:
- Observable: 20.
Score: 1;
Evidence Value: 1.
-
Student:Right!
-
Teacher:The student got this item correct.
- Observable: 104.
Score: 0;
Evidence Value: 0.
-
Student:Nice try, but incorrect. You typed the next number in the
sequence, but you should have typed in the common difference, which is 20.
-
Teacher:The student got this item incorrect.
- Observable: .
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that was incorrect. To find the common difference
in an arithmetic sequence, figure out the difference between any adjacent pair of numbers.
-
Teacher:The student got this item incorrect.
Metadata:
Item Node: tCommonDifference1c,
Difficulty: 1.
Proficiencies: CommonDifference.