Question

Select ALL the equations represented by this tape diagram.

Answer 1

I think A, C and D

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Answer 2

A, C, and D

Explanation:

A is one answer because if you were to add 3.9 and the value of ?, you would get 8.6. The same would apply to C, just backwards because it is 8.6 = 3.9 + ?. Finally, D is another answer because if you subtract 3.9 from 8.6, you will get the value of ?.