can you explain without using excel

s.t. 1) Given the following linear programming problem: Max 2 = 5x + 3y 3x + y s 40 2x - y 2 10 What would be the values of x and y that will maximize revenue? A)X = 13; y = 1 B)x= 13.33; y = 0 C)x= 10; y = 10 D) x = 0; y = 40 2) How much longer is the total arc length in the current network than the total arc length of the minimal spanning tree? A) 55 B) 45 C) 40 D) 65 11 10 15 13 17 3) Assume that it takes a college student an average of 8 minutes to find a parking spot in the main parking lot. Assume also that this time is normally distributed with a standard deviation of 4 minutes. What time is exceeded by approximately 80% of the college students when trying to find a parking spot in the main parking lot? A) 12.6 minutes B) 4.6 minutes C) 3.4 minutes D) 10.2 minutes