A 1000-ft –long pipeline requires an excavation 4 ft wide to an average depth of 5 ft. If the soil is dry common earth(angle of repose = 32°), what size triangular spoilbank will be created by the excavation?(The pile length is 300ft. and soil’s swell will be25%)

Your cleary not see the answer is 25

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,

11 mintues is the naswer