If I have a A+ in a class and get a bad score on a quiz that's worth 10% of my grade, would my grade go down a letter grade or a few points

The only way you'd go down a whole letter grade is if you scored 0 points

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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the answer is b for brother