) In kickboxing, the energy needed to break a board of standard width and thickness varies inversely with the length of the board. If 4 Joules of energy are required to break an 18-inchboard, how many Joules of energy are required to break a 20-inch board? Please include the following in your work: a) A statement defining any unknown quantities in the problem in terms of variables. b) An equation involving the variable(s) corresponding to the information given in the problem. c) A complete solution to the equation, showing all work. d) A answer to the question asked, including appropriate units