Is it true that the order when dividing three real numbers does not effect the answer?

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?

Which expression shows the sum of the polynomials with like terms grouped together

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual