c Find the maximum volume (to the nearest unit). 8 A window frame is in the shape of a semicircle joined to a rectangle. Find the maximum area of a window using 300 cm of framework.B 10 A bushwalker can walk at 5 km/h through clear land and 3 km/h through bushland. If she has to get from point A to point B following a route indicated at Clear Bush right, find the value of x so that the route is covered 3 km in a minimum time. (Note: time = distance X speed A 2 km