Asked by sh

Students build four electromagnets and test them by picking up metal tacks. Here are their partial results.
12 coils 4 tacks
24 coils 9 tacks
36 coils 13 tacks
48 coils ? tacks
Which is the best prediction for the number of nails the electromagnet with 48 coils will pick up?(1 point)
Responses

20 tacks
20 tacks

12 tacks
12 tacks

13 tacks
13 tacks

16 tacks
16 tacks

All Answers 1

Answered by GPT-5 mini AI
16 tacks

Reason: The increases go 4 → 9 (+5) and 9 → 13 (+4). If the increment decreases by 1 again (+3), 13 + 3 = 16. Also 16 is the closest choice to a linear fit (about 17.5).