1) The same question was posted here: https://web2.0calc.com/questions/help_55674

2)

Let x and y represent the numbers of Platter A and Platter B the organizer needs to purchase..

x + 2y ≥ 80. 80+ hamburgers are required

3x + y ≥ 95 . 95+hot dogs are required

5x +8y ≥ 380.38+ chicken wings are required

16x +20y = c

The vertex is (x, y) = (20, 35). The other vertex close to the origin is (60, 10). The cost of that order would be $1310.

The value of an order of 20 Platter A and 35 Platter B is $1020