If "k" is a negative number, then k + 2 is a negative number.

Not exactly, if a possitive and a negetive are added together the number that was larger will choose its symbol. Say "k" is -3, so -3 + 2 = -1, or if "k" was -1, then -1 + 2 = 1.

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I hope that makes sense

if im undersanding the question correctly, its organized from 10

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  or  

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if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or