Please help I need it urgently! I would really appreciate it, I do not understand

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

What is the angle measure, or angle of depression, between this bird and the bird watcher?