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Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it. how many multiple-choice questions are on the test?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?