A piece of marble has been machine-carved into the shape of a cone with the dimensions shown. It has a mass of 1,255 kg. What is the density of the marble, to the nearest kilogram per cubic meter?

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint

Step by step explanation pls for 10 pts the length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?