If a train travels one mile (5,280 feet) while climbing a hill at an angle of five degrees, approximately how many vertical feet has the train climbed?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

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.

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?