I do not know this what is (56a)+6,787 * 84 plzs send me how you got the answers

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.