Final answer:
The height of the screen on Amber's drawing will be 3 inches.
Step-by-step explanation:
To find the height of the screen on Amber's drawing, we can use the scale factor.
The scale factor represents the ratio of the dimensions in the drawing to the actual dimensions.
In this case, the scale factor is:
Scale factor = Width on drawing / Actual width
= 9 in. / 60 ft
= 1/80
To find the height on the drawing, we can multiply the actual height by the scale factor:
Height on drawing = Actual height x Scale factor
= 20 ft x 1/80
= 1/4 ft
= 3 in.