The speed of sound in air on a certain stormy day is about 1130 feet per second. You see a flash of lightning striking some dist
ance away, and seven seconds later you hear the clap of thunder. How many miles away did the lightning strike? Round your answer to the nearest mile. Note: The speed of light is so much faster than the speed of sound that you can assume that the strike occurs at the instant you see it.
Remember, all the interior angles of a triangle add up to 180 degrees. Therefore, we can find the value of x by subtracting the values of the other angles from 180: