By the time the first white settlers arrived, Native Americans knew how to grow almost 100 different kinds of crops. These were used as medicines and dyes, as well as food. In addition to gathering and farming, most Native Americans hunted for meat. In the 1500s, the Spanish brought horses to America.
more ... The operation that reverses the effect of another operation. Example: Addition and subtraction are inverse operations. Start with 7, then add 3 we get 10, now subtract 3 and we get back to 7. Another Example: Multiplication and division are inverse operations. Start with 6, multiply by 2 we get 12, now divide by 2 and we get back to 6.
The order of operations is the order in which we add, subtract, multiply or divide to solve a problem. The steps that we use to solve any mathematical expression are: Simplify all of the parentheses. This includes all forms of the grouping symbols such as brackets, braces and parentheses. Simplify all exponents.