Plz answer

SHORT ANSWER, with work required to be shown, as indicated. 18. Find the equation for a line which passes through the points ( 1, 7) and (1, 3). Write the equation in slope-intercept form. Show work. 19. Find the exact solutions and simplify as much as possible: 9.):2 + 4 = 249:. Show work. 20. Let for) = 5x2 + 9 and g(x) =x 3. (a) Find the composite function (f o g)(x) and simplify. Show work. (b) Find (fog)( l) . Show work. 21. A projectile is launched from a platform 12 feet high with an initial velocity of 112 feet per second, The height h of the projectile at t seconds after launch is given by h = 16!2 + 1 12: + 12 feet. (a) How many seconds after launch does the projectile attain maximum height? Show work. (b) What is the maximum height? Show work. x+7 12 22. Solve: + x+6 x236 = 0 . Show work. 23. Suppose that cos 6': 45 and that 6 is a Quadrant IV angle. (a) Find the exact value of sin 6'. Show work. (b) Find the exact value of sin(26'). Show work. 24. Prove the identity (sin x cos x 2 = 1 sin 27: Page 6 of 7