Evaluate −4x+y when x=5/4 and y=1/5. write your answer as a mixed number in simplest form.
when x=5/4 and y=1/5, −4x+y= *blank*
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What is the area of triangle abc if a = 8, b = 11, and c = 15?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.