Is 11 feet,13 feet and 21 feet a right triangle

How many zeros does the function f(x)=4x3-x2+1 have

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]