19. Find the exact solutions and simplify as much as possible: 21': = 6x + 3. Show work. 2]; A projectile is launched fromaplatfonn IS feet high with an initial velocity of 144 feel per second. The height .'i of the projectile at i' mounds after launch is given by h = I61' + 1441' + I3 feeL {a} How many seconds after launch does die projectile attain maitimum height? Show work. {13] What is the maximum height? Show work. x6 16 + :r 4 x2 16 = '3'. Showvt'ork. 22. Solve: 23; Suppose that cos 3 = 45 and that 9' is a Quadrant [V angle. (3] Find the exact value of sin 3. Show ivurlt. (h) Find the exact value of sin{29 ). Show work. 24. Prove the identity 1 (cos x sin I]! = sin 2