Answer:
Step-by-step explanation:
-0.25
-1/3
1/4
0.3
You would have 4 left after dinner: (.875)(32)=28 so you have 28 completed before dinner and would have 4 left to do.
In the standard form of quadratic
![ax^{2} +bx+c](https://tex.z-dn.net/?f=ax%5E%7B2%7D%20%2Bbx%2Bc)
the discriminant is
![b^{2} -4ac](https://tex.z-dn.net/?f=%20b%5E%7B2%7D%20-4ac)
In your quadratic, a = 1, b = -9 and c = -10
Now you need to plug these values into the expression for the discriminant.
Answer:
C. ![3.2\times 10^{1}](https://tex.z-dn.net/?f=3.2%5Ctimes%2010%5E%7B1%7D)
Step-by-step explanation:
= Diameter of a red blood cell = ![0.0008\ \text{cm}](https://tex.z-dn.net/?f=0.0008%5C%20%5Ctext%7Bcm%7D)
= Diameter of a whooping cough virus = ![2.5\times 10^{-5}\ \text{cm}](https://tex.z-dn.net/?f=2.5%5Ctimes%2010%5E%7B-5%7D%5C%20%5Ctext%7Bcm%7D)
Ratio of the diameter of the red blood cell to the diameter of the whooping cough virus
![\dfrac{d_r}{d_w}=\dfrac{0.0008}{2.5\times 10^{-5}}=\dfrac{0.0008}{25\times 10^{-6}}=\dfrac{0.0008\times 10^6}{25}\\\Rightarrow \dfrac{d_r}{d_w}=\dfrac{800}{25}\\\Rightarrow \dfrac{d_r}{d_w}=32=3.2\times 10^{1}](https://tex.z-dn.net/?f=%5Cdfrac%7Bd_r%7D%7Bd_w%7D%3D%5Cdfrac%7B0.0008%7D%7B2.5%5Ctimes%2010%5E%7B-5%7D%7D%3D%5Cdfrac%7B0.0008%7D%7B25%5Ctimes%2010%5E%7B-6%7D%7D%3D%5Cdfrac%7B0.0008%5Ctimes%2010%5E6%7D%7B25%7D%5C%5C%5CRightarrow%20%5Cdfrac%7Bd_r%7D%7Bd_w%7D%3D%5Cdfrac%7B800%7D%7B25%7D%5C%5C%5CRightarrow%20%5Cdfrac%7Bd_r%7D%7Bd_w%7D%3D32%3D3.2%5Ctimes%2010%5E%7B1%7D)
The required ratio is
.