Jade is training for a marathon. During her first week of training, each run she completes is 90 minutes long. She increases the time she runs by 10% each week. Write the explicit formula to represent how many minutes she runs after n weeks.

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