25 points
a piecewise function f(x) is defined as shown.

f(x) = -5/4x = 90

which table could be used to graph a piece of the function?

Substitute the values of x from each table and see which values fit 

For example in table d  when x = 40 y = (-3/8)*40 + 75  =  60    which is the result  given in table d

The other 2 values also fit  table d

Answer is table d.

She will need 5/8 bags for each square yard.