### Elementary Arithmetic

Arithmetic is a branch of mathematics concerned with the basic operations of addition, subtraction, multiplication, and division, and the study of numbers and their properties. …

A mathematical function is a set of ordered pairs that assigns a unique output value to each input value. Functions are often represented by symbols, such as y=f(x), where x is the input and y is the output. Functions can be linear, quadratic, polynomial, trigonometric, exponential, logarithmic, etc. and are used to model real-world phenomena and make predictions based on data.