SO, when a question says is it means equals. When it says of what it means multiply (usually). So, the beginning equation of this would be... 24.5/100 (x) = 15 (< also instead of putting (24.5/100) you could put .245) to get rid of the (24.5/100) on the left side we multiply both sides by the reciprocal. So.... x = 15 (100/24.5) x = 61.2244
You need to draw the triangle DEF with a right angle at E. Angle D = 40 and DE = 100 m. Once you have marked up your triangle, you can use cosine to find DF.
