(4 points) For a science experiment, a projectile was launched. Its path was given by h(d)=-4.9d + 24 + 30, where h(d) is the height of the projectile above the ground and d is the horizontal distance of the projectile from the launch pad, both in metres. a) What was the initial height of the projectile? b) What was the maximum height reached by the projectile to the nearest tenth of a metre? Show all your work.