a scale drawing has a scale of 10 feet find the actual length of 40 feet
On the scale drawing, WHAT length equals one 10 feet? Is it one inch?
If so, 40 feet would be 4 inches on the drawing.
Please capitalize where your sentences begin and use correct punctuation. You also appear to have omitted a word or two.
To find the actual length using a scale drawing, you need to divide the length on the drawing by the scale factor. In this case, the scale factor is 10 feet, which means that 1 unit on the drawing represents 10 feet in reality.
To find the actual length of 40 feet using a scale of 10 feet, you divide 40 by the scale factor of 10:
Actual length = Length on the drawing / Scale factor
Actual length = 40 feet / 10 feet
The units of "feet" cancel out, leaving you with the actual length:
Actual length = 4 units
Therefore, the actual length of 40 feet on a scale drawing with a scale of 10 feet is 4 units.