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How to write 3 tenths and 5 tenths as a decimal

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.