The Pythagorean Theorem- Find the Missing Length:

To get from home to work every day, Samos drives 7 miles east on Avenue A, and then drives north on Avenue B. He knows that the straight-lines distance from his home to his place of work is about 25 miles. How many miles does he drive north on Avenue B?

a. Draw a sketch:
b. Write an appropriate formula and substitute with numbers:
c. Answer the question in words: