7. The prefix "dis-" in "disagree" changes the meaning to ___________ .

A. after
B. not
C. against
D. before

B. not

B. not

To determine the meaning of the prefix "dis-" in the word "disagree," you can break it down by looking at common prefixes and their meanings. Here's how you can find the answer:

1. Start by identifying the root word in "disagree," which is "agree."
2. Next, consider the different meanings of common prefixes. In this case, the prefix "dis-" means "not" or "opposite of."
3. Now, go through the given options: A. after, B. not, C. against, D. before.
4. By comparing the meanings, you can eliminate options A (after), C (against), and D (before), as these do not match the meaning of "dis-."
5. Option B (not) aligns with the meaning of "dis-," so the correct answer is B. not.

Therefore, the prefix "dis-" in "disagree" changes the meaning to "not."