Need help please. No .jpg files my Mobil can't access it. Pasted images would work.

9. The height (in meters) of a projectile shot vertically upward from a point 3 m above ground level with an initial velocity of 23.5 m/s is h(t) = -4.9t? + 23.5t + 3 after f seconds. a. Find the equation for the velocity of the projectile after time f. b. When does the projectile reach its maximum height? Round to 2 decimal places. c. When does it hit the ground? Round to 2 decimal places