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.
In mathematics and computer programming, the order of operations (or operator precedence) is a collection of rules that reflect conventions about which procedures to perform first in order to evaluate a given mathematical expression.