What is the cost of seeding a rectangular lawn 100 ft by 80 ft if 1 pound of seed costs $8.85 and covers 400 square feet? Use estimation to decide whether your answer is reasonable.

If the diameter of a tennis ball is 6 centimeters, what is the approximate surface area and volume of a tennis ball with a scale factor of 1.5?

A Sense of Proportion: Jupiter is about 71,000 km in radius.  The innermost Galilean moon, Io, orbits 420,000 km from the center of the planet, and the outermost Galilean moon, Callisto, orbits 1,900,000 km from the planet's center.  Design a model with Jupiter 5 inches in radius.  Where would the two moons orbit?

When a substance has a density that is less than the density of water, it floats. A wooden sphere has a radius of 4 centimeters and a mass of 250 grams. Will the wooden sphere float? Use the fact that the density of water is 1 gram per cubic centimeter. Round answers to the nearest hundredth. A.  The density of the wooden sphere is 0.93 grams per cubic centimeter, which is less than the density of water, so it will float.   B.  The density of the wooden sphere is 1.24 grams per cubic centimeter, which is greater than the density of water, so it will not float.   C.  The density of the wooden sphere is 0.93 grams per cubic centimeter, which is less than the density of water, so it will not float.   D.  The density of the wooden sphere is 1.24 grams per cubic centimeter, which is greater than the density of water, so it will float.

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?