Elementary Math problems

1. A box covers an area of 8 3/4 in.2 when resting on its base. The volume of the box is 74 3/8 in3. Can you find the surface area of the box? Explain.

2. A gold bar is similar in shape to a rectangular prism. A standard mint bar is approximately 7 in. x 3 5/8 in. x 1 3/4 in. If the vale of gold is $1,313 per ounce, about how much is one gold bar worth? Use the formula w≈11.15n, where w is the weight in ounces and n is the volume in cubic inches, to find the weight in ounces. Explain how you found your answer.