I am aware it is late so i will keep this short as possible:

1.According to postal regulations, the girth plus the length of a parcel sent by fourth-class mail may not exceed 108 in. What is the largest possible volume of a rectangular parcel with two square sides that can be sen by fourth-class mail? The answer says 11664in^3 = 6.75 ft^3.

2.A poster is to contain 108 cm^2 of printed matter with margins of 6cm each at top and bottom and 2 cm on the sides. What is the minimum cost of the of the poster if it is to be made of material costing 20 cents/cm^2? ans. is $60