<span>Income earned over one year is principal * int rate so we have
0.12*A + 0.13*B +0.14*C = 400
and A + B + C = 3000
and A+B = C</span>
Answer:
y= -2x+1
Step-by-step explanation:
y=mx+b
y= -2x +b
3= -2(1) +b
3= -2 +b
b=1
y= -2x+1
Multiply dollars / unit * units. It is actually a useful thing to know. Many thing are done using the tools this question requires.

Steve takes home 308.56 dollars. The answer is B.
The baker uses 4 5/12 lb of sugar. She has 7/12 left