Question

A forest fire covers 1600 acres at time t=0. the fire is growing at a rate of 9\sqrt{t} acres per hour, where t is in hours. how many acres are covered 16 hours later?

Answer 1

To solve this problem you must apply the proccedure shown below:

 1. You have that the forest fire covers 1600 acres at time t=0. the fire is growing at a rate of 9√t acres per hour. Therefore, you have:

 1600+∫(9√t)dt (from 0 to 16)

 2. Then, when you solve it, you obtain:

 1600+6t^3/2=1984

 3. Therefore, as you can see, the answer is: 1984 acres.