How are the expressions 8 - 15 and 8 +(15) alike? How are they different?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

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Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?