Answer:
15 mL of the solution with 20% water will be needed.
Step-by-step explanation:
Use the inverse relationship
10 mL * (18-15)% = x mL * (20-18)%
x = 10 mL * (3/2) = 15 mL
Step-by-step explanation:
We can immediately eliminate answers B and C because we have >, meaning that the circle on the number line has to be open.
-2x+7>17
subtract 7 on both sides
-2x>10
divide by -2. remember that dividing by a negative flips the greater than or less than sign.
x<-5
the answer is D
Answer:
![A=81\pi $ m^2](https://tex.z-dn.net/?f=A%3D81%5Cpi%20%24%20m%5E2)
Step-by-step explanation:
Circumference of the column ![=18\pi $ meters](https://tex.z-dn.net/?f=%3D18%5Cpi%20%24%20meters)
Circumference of a circle![=2\pi r](https://tex.z-dn.net/?f=%3D2%5Cpi%20r)
Therefore:
![2\pi r =18\pi $ meters\\2r=18\\r=18 \div 2\\$Radius, r=9 meters](https://tex.z-dn.net/?f=2%5Cpi%20r%20%3D18%5Cpi%20%24%20meters%5C%5C2r%3D18%5C%5Cr%3D18%20%5Cdiv%202%5C%5C%24Radius%2C%20r%3D9%20meters)
Area of a Circle ![=\pi r^2](https://tex.z-dn.net/?f=%3D%5Cpi%20r%5E2)
Since radius of the cross section of the column =9 meters
Area of the cross section of the column
![=\pi *9^2\\=81\pi $ m^2](https://tex.z-dn.net/?f=%3D%5Cpi%20%2A9%5E2%5C%5C%3D81%5Cpi%20%24%20m%5E2)
the answer should be C. 5.27
Answer:
1.5 because it is the average of the two middle numbers in this scenario.