Identify the like terms in the expression 7x+4y+3y+7 a 7x and 7
b 4y and 3y
c 7
d 7, 4, 3

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Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

Consider the sequence below. 3 , 1 , 1/3 , 1/9 , select the explicit function which defines the sequence.