3-8 equals to -5 because if you stele a number line and count 8 points from three it will equal -5
6; because they are an equal distance apart
Hello,
Let's assume n the number searched.
nine less 3 times n is written 9-3n
The height is 6tan(60)=10.39 then plug that in to trapezoid area formula
(11+6+15)/2*10.39=166.24