Find the minimum cost of a rectangular box that is three times as long as it is wide and which holds 100 cubic centimeters of water. The material for the bottom costs 7¢ per cm?, the sides cost 5¢ per cm² and the top costs 2¢ per cm?

Living room: 15'0"x18'0" Foyer: 6'0"x7'6" Study: 9'0"x15'0" Master Bedroom: 12'0"x13'6" If carpet costs $11.56 per square yard, what is the cost to carpet the living room, foyer, study, and master bedroom?

An artist is making a sculpture consisting of three oblique triangular prisms that support a cube to install in a park in San Francisco. He is going to make the sculpture out of bronze and needs to know how much bronze to order and how much it is going to cost. He can order bronze for $1.13 per pound from a local supply yard. The bronze weighs 541 pounds per cubic foot. Each triangular prism has a height of 6 ft and a base area of 4 ft?. The cube that will go on top will have a side length of 3 ft. 1. What is the volume of the sculpture? 2. What is the total cost of the bronze?

the roof of a house has a shape of a pyramid with a square base of 8m sides. the height of this pyramid is 3m. mr. gordon wants to cover this roof with plywood worth $28 per m2. what will be the cost of this renovation.

A square building is 300 ft in length and width. A copper pipe purchased for $2.25/ ft is placed from one corner to the corner diagonally opposite. How long is the pipe and How much did the pipe cost?

A concrete slab consists of a rectangle 37' by 34' with a uniform thickness of 2'. What is the cost of the slab if the concrete weighs 150 pounds per cubic foot and cost $0.04 per pound? *

The next day Hagrid wants to build some pens for his creatures. He wants to build one rectangular enclosure that is divided into three equal parts. If he has 1000 ft. of fencing to use, what is the largest area he can enclose?

The length and width of a room measure 8 yards by 3 yards, and the walls of the room are 8 feet high.  If the walls are to be painted with a paint that claims to cover 100 square feet per quart, how many quarts of paint will be needed?

A packing box has a volume of 30 cubic inches. How much would a similar box with twice the dimensions hold?

To save money, the owners of the Half Circle Pizza Shop decided to fold their pizzas in half (into calzones). The new box shape will allow them to reduce the size of their boxes to half as wide, but the boxes will be 50% taller. If the original box was 10 in. × 10 in. × 2 in., what is the surface area of the new box? What is the difference of the surface areas?