A class has 25 students. In how many seats can four students be chosen as class leaders?

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Let f(x) = 1/x^2 (a) use the definition of the derivatve to find f'(x). (b) find the equation of the tangent line at x=2