Find the value of c such that each expression is a perfect-square trinomial.
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1. x^2-16x+c
2. p^2-14p+c
3. b^2+18b+c
4. n^2-n+c

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?