Question 1 is fairly straightforward. Since only 12 years have passed the population will only increase by . So the population will increase by:
Moving on to question 2. First of all to get your position you need to integrate your formula for velocity and take into account the constant:
To find the value for the constant use the information given when t= 0, x = -2:
To find where the particle is you just need to put each of the values asked for into the equation in place of t.
Finally for 3:
Rearrange the equation so x terms are all on the same side and the same with the y terms
Then integrate to get:
Rearrange to make find an equation for y: