Final answer:
Interval notation includes symbols 'INF' for infinity and '-INF' for negative infinity, with 'U' representing union. Scientific notation is a way of expressing large or small numbers, with different rules for addition, subtraction, multiplication, and division involving the number's coefficient (N) and exponent (n).
Step-by-step explanation:
When working with interval notation in mathematics, especially on platforms like WeBWork, it's important to use specific symbols to represent infinity and the union of sets. The symbol 'INF' is used for positive infinity, while '-INF' is used for negative infinity. Moreover, the ' U ' symbol is utilized to represent the union of two sets. For example, if you want to describe all real numbers except zero, you would use the interval notation '(-INF, 0) U (0, INF)'.
In scientific notation, a shorthand notation for writing very large or very small numbers, the number is expressed as a product of a number between 1 and 10 and a power of 10. For addition and subtraction in scientific notation, the exponents must be the same. However, for multiplication and division, you multiply or divide the coefficients (N) and add or subtract the exponents (n), respectively. This notation makes mathematical operations with extreme values more manageable.