Answer:
70
Step-by-step explanation:
Answer:
13 l of 15%, 13 l of 25%, 26 l of 70%
Step-by-step explanation:
solutions:
final solution:
This includes 0.45*52l= 23.4 l acid
Let's assume:
- amount of 15% solution= x
- amount of 25% solution= y
- amount of 70% solution= z
- and we have z=2y
so there are 2 equation:
or
- x+y+2y= 52 ⇒ x+3y= 52 ⇒ x= 52- 3y
- 0.15x+1.65y=23.4
- 0.15*(52-3y)+1.65y=23.4
- 7.8-0.45y+1.65y=23.4
- 1.2y=23.4-7.8
- 1.2y= 15.6
--------
- x= 52- 3*13= 13 l
- z= 2y= 2*13= 26 l
Answer:
outfit costs 81 dollars
Step-by-step explanation:
Answer:
111
Step-by-step explanation:
il help u if u help me look at my thing and ill help u
Answer:
![D=0](https://tex.z-dn.net/?f=D%3D0)
The quadratic equation has one real root with a multiplicity of 2.
Step-by-step explanation:
Given a quadratic equation:
![ax^2+bx+c=0](https://tex.z-dn.net/?f=ax%5E2%2Bbx%2Bc%3D0)
You can find the Discriminant with this formula:
![D=b^2-4ac](https://tex.z-dn.net/?f=D%3Db%5E2-4ac)
<em> </em>In this case you have the following quadratic equation:
![4x^2+12x+9=0](https://tex.z-dn.net/?f=4x%5E2%2B12x%2B9%3D0)
Where:
![a=4\\b=12\\c=9](https://tex.z-dn.net/?f=a%3D4%5C%5Cb%3D12%5C%5Cc%3D9)
Therefore, when you substitute these values into the formula, you get that the discriminant is this:
Since
, the quadratic equation has one real root with a multiplicity of 2 .