3. Juan Soto (He plays for the Washington Nationals baseball team.) hits a baseball 3 feet above the ground. The ball leaves the bat with a speed of 109.2 miles/hour. The ball lands, in the stands, 435 feet from Juan at a height of 15 feet above ground. What is the angle of elevation with the horizontal of the ball? (This is the most talked about, in baseball, launch angle.) 4. Find dy/ dx and day/dx and find the slope and concavity (if possible) at the given value of the parameter. x =t' + 5t +4, y=4t when t= 1