help solving this problem
The demand for Sigma Mu Fraternity plastic brownie dishes is
q(p) = 361,201 − (p + 2)2
where q represents the number of brownie dishes Sigma Mu can sell each month at a price of p¢. Use this function to determine the following.
(1) the number of brownie dishes that Sigma Mu Fraternity can sell each month if the price is set at 90¢
(2) the number of brownie dishes they can unload each month if they give them away
(3) the lowest price at which Sigma Mu will be unable to sell any dishes

Question

help solving this problem
The demand for Sigma Mu Fraternity plastic brownie dishes is 
q(p) = 361,201 − (p + 2)2 
where q represents the number of brownie dishes Sigma Mu can sell each month at a price of p¢. Use this function to determine the following. 
(1) the number of brownie dishes that Sigma Mu Fraternity can sell each month if the price is set at 90¢
(2) the number of brownie dishes they can unload each month if they give them away
(3) the lowest price at which Sigma Mu will be unable to sell any dishes