You hike uphill of 200 feet per minute. your friend hikes a downhill on the same trail at a rate of 250 feet per minute. how long will it be until you meet?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Adoughnut shop charges $0.50 for each doughnut and $1 for a carryout box. shirley has $10 to spend. which inequality can be used to find d, the number of doughnuts she could have bought if she also wants them in one carryout box?