Students are working independently to solve the equation -4 + ? = -10. The teacher says the following to help them understand the problem."If you owe somebody $44 dollars, you have a negative $44 dollar balance with that person. If you borrow more money from the person, you will owe more and have a more negative balance with that person."After speaking with several students, the teacher finds that some of them are still having trouble with the concept of negative numbers. As a result, the teacher then reteaches the concept using a number line. Which of the following types of assessments has the teacher used?A. FormativeB. SummativeC. FormalD. Criterion

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