is the factored form of given polynomial 
<em><u>Solution:</u></em>
Given that we have to factor the given polynomial
Factoring: Finding what to multiply together to get an expression. It is like "splitting" an expression into a multiplication of simpler expressions.
<em>Factoring a polynomial involves writing it as a product of two or more polynomials</em>
Given polynomial is: 
Step 1 :
We can use factoring by grouping
Group
with 3xy and −12y with 9x then factor each group.

Taking -y as common term from first two terms and -3 as common term from last two terms

Now taking (4y - 3x) as common term

So the given polynomial is factored
12w+15r=18.30 /*2
15w+10r=16.75 /*3
24w+30r=36.60, subtract this equation from the other one
45w+30r=50.25
21w=13.65
w=13.65/21
w=0.65 is a cost per pound for wheat flour
From the first equation we have
r=(18.30-12w)/15
r=(18.30-12*0.65)/15
r=0.70 is a cost per pound for rye flour
Area is 8 ft squared
Hope that helped