It means a D average in you class, or classes.
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A 3.4 grade point average, or GPA, means that you got mostly B's and A's while you were in school. It's also possible that you got an occasional C, but a 3.4 indicates that overall you were a very good student.
20 with an exponent of 2 means 20 squared, or 20 times 20, or 400. An exponent of 3 means 20 cubed, or 20 times 20 times 20, or 8000. The exponents work as they do for any other base.
Simple. When a number is 'squared' it simply means it is multiplied by itself. So, '20 squared' means 20 x 20, which equals 400.
5 + n = 20======== ( and, in this case, means addition and is means equal )
20% means 20/100 = 0.20