In the diagram below of right triangle DAB, AC is the altitude to hypotenuse DB, DC = 9 and DB = 14.
PART A: What is the length of DA in simplest radical form?

Aphrase is shown read the phrase and give me the answer

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.

Which expression is equal to (f+g)(x)?