The first Weather Bureau Office to open in Arizona was in Yuma where the duties were transferred from the Army at Fort Yuma in July 1891. Tucson followed in September of that year, and it was not until four years later that the small community of Phoenix rated a full station.
Different types of graphs depend on the type of function that is graphed. The eight most commonly used graphs are linear, power, quadratic, polynomial, rational, exponential, logarithmic, and sinusoidal. Each has a unique graph that is easy to visually differentiate from the rest.
1 The graph of a function is a picture of all of its (input,output) pairs. We put the inputs along the horizontal axis (the $\,x\,$-axis), and the outputs along the vertical axis (the $\,y\,$-axis).  Thus, the graph of a function $\,f\,$ is a picture of all points of the form [beautiful math coming...