$2900 at 13% for 30 years. i need simple interest and compounding interest

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Mila's dog weighs 4 pounds more than 8 times the weight of keiko's dog. which expression could be used to fine te weight of mila's dog?