The populations of two cities after t years can be modeled by -150t+50,000 and 50t+75,000. . What is the difference in the populations of the cities when t=4

Answer:
25,800
Step-by-step explanation:
-150(4) + 50,000 = 49,400
50(4) + 75,000 = 75,200
75,200 - 49, 400 = 25,800