Answer:
The height will be 17.5 cm
Explanation:
If we look at the graph, the x axis shows the time passed and the y axis shows the height. By following the graph, if we see at the mid point of 3 and 4 it comes out to be 3.5 and the same thing can we do for y axis as well, the point on y axis will be the mid point of 15 and 20 which come out be 17.5 centimeters.