This is how you do it. Set two equations equal to each other then solve. Plug in x for each equation, find the answers. AC is the base because it is not congruent to any other side.
The answer would be two bags because he has 54 square yards to fill.
No as they do not simplify into the same fraction
linear as it the volume is a fraction to the side
All sides of a rhombus are congruent. 28/4 (four sides) =7
Each side is 7 cm long
F(2a-3/5) = 4a^2 + 8a/5 + 4/25