Item: tExplicitArithmetic2a
Stem:
The first four terms of an arithmetic sequence are given below.
Choose the algebraic expression that represents the nth
term in this sequence.
10, 13, 16, 19, . . .
Options:
3n + 10
3n
3n - 7
3n + 7
10n - 3
Key:
- Observable: 4.
Score: 1;
Evidence Value: 1.
-
Student:Right! The expression you selected, 3n + 7, is correct.
-
Teacher:The student got this item correct.
- Observable: 1.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 3n + 10, is incorrect. The sequence in the question is: 10, 13, 16, 19,... But the expression you selected describes the sequence: 13, 16, 19, 22,...
-
Teacher:The student did not get this item right.
- Observable: 2.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 3n, is incorrect. The sequence in the question is: 10, 13, 16, 19,... But the expression you selected describes the sequence: 3, 6, 9, 12,...
-
Teacher:The student did not get this item right.
- Observable: 3.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 3n - 7, is incorrect. The sequence in the question is: 10, 13, 16, 19,... But the expression you selected describes the sequence: -4, -1, 2, 5,...
-
Teacher:The student did not get this item right.
- Observable: 5.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, the expression you selected, 10n - 3, is incorrect. The sequence in the question is: 10, 13, 16, 19,... But the expression you selected describes the sequence: 7, 17, 27, 37,...
-
Teacher:The student did not get this item right.
Metadata:
Item Node: tExplicitArithmetic2a,
Difficulty: 2.
Proficiencies: ExplicitArithmetic.