Item: tSolveGeometricProblems1b
Stem:
Which of the following is not a geometric sequence?
Options:
2, 8, 32, 128, ...
10, 13, 16, 19, ...
5, 10, 20, 40, ...
3, 6, 12, 24, ...
Key:
- Observable: 2.
Score: 1;
Evidence Value: 1.
-
Student:That's correct! You have selected the sequence that is not geometric.
-
Teacher:From among a set of options, the student correctly identified which sequence was not geometric.
- Observable: 1.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's incorrect. The sequence 2, 8, 32, 128, ... is geometric. Each term is equal to the previous term times four, so this is a geometric sequence with a common ratio of 4.
-
Teacher:The student was not able to identify a non-geometric sequence from among a set of options.
- Observable: 3.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's incorrect. The sequence 5, 10, 20, 40, ... is geometric. Each term is equal to the previous term times two, so this is a geometric sequence with a common ratio of 2.
-
Teacher:The student was not able to identify a non-geometric sequence from among a set of options.
- Observable: 4.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that's incorrect. The sequence 3, 6, 12, 24, ... is geometric. Each term is equal to the previous term times two, so this is a geometric sequence with a common ratio of 2.
-
Teacher:The student was not able to identify a non-geometric sequence from among a set of options.
Metadata:
Item Node: tSolveGeometricProblems1b,
Difficulty: 1.
Proficiencies: solveGeometricProblems.