Answer: quick mix is better
13.50+6.90(4)= 41.1
7.20+7.20(4)+5.90=41.9
Answer:the error is when 6y=12
Step-by-step explanation:
the original problem says 4x-6y=12
so when you get rid of the 4x, it should still be -6y not positive





Formula used = (a + b) (a - b) = a² - b²
First what you need to do is 4.2 x 0.6 and that will be you answer.
I believe this is how you do it