A triangular brick wall is made by cutting some bricks in half to use in the first column of every other row. The wall has 28 rows. The top row is one-half brick wide and the bottom row is 14 bricks wide. How many bricks are used in the finished wall?

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Q:What do the repetitive patterns in a mineral form?

There are repeating pattern of a mineral's particles form a solid called a crystal. The particles of those crystal line up in a pattern that repeats. A crystal has flat sides, sharp edges and corners. Crystal formation is one of the measures that a substance must have for the substance to be classified as a mineral.

Q: What is the term for the ability of a mineral to break into flat surfaces?

When we are determining the hardness of the mineral, the bonding and molecular structure of a given mineral will also determine the manner in which a mineral breaks.  OR The way a surface reflects light is called luster and two major types of luster are metallic and nonmetallic Therefore the tendency of a mineral to break along these flat parallel surfaces is known as cleavage.

Q: What is the term for an irregular way a mineral breaks apart? |

Fracture is the term for an irregular way of mineral breaks apart. A mineral that splits easily along flat surfaces has the property called cleavage. Most minerals do not split apart evenly. Instead, they have a characteristic type of fracture, which describes how a mineral looks when it breaks apart in an irregular way.