how can I use a scale of 1/2in.:15 ft to reproduce a scale drawing of a soccer field?

Answer 1

well, think about it. Every 15 ft of the field is 1/2 in in your drawing.

So, if the field is 150ft long, that is (1/2)*10 = 5in in the drawing.

So, find out how big the field is, divide both dimensions by 15, and use that many 1/2-inches in the drawing.