Mr. Jones noticed that his downspouts, which run vertically down the corners of his house, are not working correctly. To reach the gutters on the front porch, the ladder must reach 12 feet above the ground.

If Mr. Jones places the ladder 3 feet from the base of the house, how long must the ladder be so that Mr. Jones can reach the gutters?

Show or explain all of your steps for your answer.

Round your answer to the nearest tenth, if necessary.