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It depends on the context. If the students are acting individually, then "are" is correct: Three-quarters of the students are failing the class. If you are referring to a single collective entity then "is" is correct: Three quarters of the students is an unacceptable number of failures.
Sometimes. "Scalene" simply means that the three sides have different lengths. This does not imply that the triangle has to have an obtuse angle.
Three students can be selected from 5 in (5 x 4 x 3) = 60 ways.BUT there are (3 x 2) = 6 ways to select the same 3 students.So there are only 60/6 = 10 different groups of 3 studentsthat can be selected from a pool of 5.
yes. three lines can coplaner.
sometimes