Answer:
250; [tex]p= 300 + \frac{50}{3}t[/tex]
Step-by-step explanation:
a. 15 minutes passed, so there would be 250 people who came in
b. You would create a formula, where t = time after 8:15 (in minutes), while p = people who are at the parade
[tex]300 + \frac{250}{15}t = p[/tex], which equals [tex]p= 300 + \frac{50}{3}t[/tex]