Ben buys 18 pieces of bubble gum. he gives each of his 2 best friends 5 pieces of the gum. how many pieces of bubble gum does ben have left? a) 5 pieces b) 6 pieces c) 8 pieces d) 10 pieces

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field