I believe the answer is 9.8
The correct selling price is about $20, and the likely mistake was the manager multiplied the $12 by .67 (the 67%), got about 8, and took that as the price instead of adding it to the original 12, which is what they were supposed to do.
The equation is the following
This is a difference of two squares, the first one being the square of
, the second one being the square of
. The difference of two squares can be factorized as
If we apply this rule to our equation, we find
Solution:
Let the volume (in litres) of acids used be:
x1=amount of 25% acid
x2=amount of 40% acid
x3=3*x2=amount of 60% acid
Answer:
-4
Step-by-step explanation:
Indeed, the y-value changes by 4 when the x-value changes by 1. However, the y-values <em>decrease</em> when the x-values increase. That means the slope is <em>negative</em> 4.
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Any line that goes down to the right has a negative slope. Its slope is positive if it goes up to the right.