a Civil War reenactment, a cannonball is fired into the air with an initial vertical velocity of 128 feet per second. The release point is 6 feet above the ground. The function h=−16^2x+128x+6 represents the height h (in feet) of the cannonball after t seconds. a. Find the height of the cannonball each second after it is fired. b. Use the results of part (a) to estimate when the height of the cannonball is 150 feet. c. Using a graph, after how many seconds is the cannonball 150 feet above the ground?