From my early quiz about quantity supply and quantity demand. I need help why am I wrong or how to get the right answer? I actually forgot how I even got my right answer Id love an explanation on those too. This was a quiz back in september?

Gradebook - View @ Original Response O Unfiltered Response Using the information below answer the following questions. (12pts) If demand is :Qd = 850 - 5 P and supply is: Qs = 150 + 15 P Where: Qd = quantity of the good demanded Qs = quantity of the good supplied. P = price of the good Part 1: The equilibrium price is Your response Correct response 35 35 + 3.0% Auto graded Grade: 2/2.0 Part 2: The equilibrium quantity is Your response Correct response 675 675 + 3.0% Auto graded Grade: 2/2.0 Which of the following quantity should be considered for a quota. Q= 685 or @ 680 or Q=665 Part 3 Equilibrium Quantity after Quota Your response Correct response 680 665 + 3.0% Auto graded Grade: 2/2.0 0 Equilibrium Price after Quota Your response Correct response 45 37 + 3.0% Auto graded Grade: 0/2.0 0 Part 4: An imposed price of 17.5 is Your response Correct response Price Floor Price ceiling Auto graded Grade: 0/2.0 6 yields an excess Your response Correct response demand demand Auto graded Grade: 2/2.0 0 of Your response Correct response 350 + 3.0% 3 Auto graded Grade: 0/2 0 03