Physics students are modeling the height of an object dropped from top of a 90 foot tall building. It is let go at t = 0 seconds and using photography the students are able to measure, accurate to the nearest tenth of a fool, the height that the object is above the ground every half-second. The data is shown below.

You can find the constant of proportionality by finding the ratio of

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?  

For which rational expression is -2 an excluded value of x