Is -4 rational or irrational

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Select a graph that have an equation with a < 0

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin