First we need to convert them into like terms. Three fifths is twelve twentieths. Three fourths is fifteen twentieths. Together that is twenty-seven twentieths. That is one and seven twentieths or 1.35 in decimal.
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It is a mixed fraction. A real number, a rational number.
It is the commutative property of addition of real numbers.
With the exception of zero, which is neither positive nor negative, every real number is either plus or minus. With positive number, the + sign is often implied and therefore is not always written [example: 3 and +3 both mean positive three]
No real roots.
There is not a real number between them. If there is then it would most likely be three and one half.