If 5 is the first term, what is the 11th term in the following sequence?
5, 10, 20, 40, 80, ...
Enter your answer here:
5120
Right!
The student correctly found the 11th term of a geometric sequence.
160
That's incorrect, but you are close. You correctly identified the rule for generating successive terms in the sequence, but you found the next term, instead of the 11th term.
The student found the next term of a geometric sequence, instead of the 11th term.
2560
That's incorrect, but you are close. You correctly identified the rule for generating successive terms in the sequence, but you found the 10th term, instead of the 11th term.
The student found the 10th term of a geometric sequence, instead of the 11th term.
10240
That's incorrect, but you are close. You correctly identified the rule for generating successive terms in the sequence, but you found the 12th term, instead of the 11th term.
The student found the 12th term of a geometric sequence, instead of the 11th term.
85
Sorry, that's incorrect. It looks like you found the difference between the first two terms in the sequence, and added this value to the 5th term. But this is a geometric sequence, so you should multiply to find successive terms. Also, you are looking for the 11th term, rather than the next term.
The student may have misidentified the sequence as arithmetic instead of geometric. Also, the student may have tried to generate the next term, instead of the 11th term.
110
Sorry, that's incorrect. It looks like you found the difference between the first two terms in the sequence, and added this value to generate successive terms. But this is a geometric sequence, so you should multiply to find successive terms.
The student may have misidentified the sequence as arithmetic instead of geometric.
2048
Sorry, that's incorrect. It looks like you correctly recognized that this is a geometric sequence with a common ratio of 2. In fact, you gave the correct answer for the sequence 2, 4, 8, 16, 32,... But this sequence has a starting term of 5.
The student probably recognizes that this is a geometric sequence with a common ratio of 2, but maynot have considered the importance of the initial term.
Sorry, that was incorrect.
The student got this item incorrect.
ExtendGeometric