Answer:
what kind of practice test?
Step-by-step explanation:
i dont understand but if you need help practicing i will help you.
Answer:
43200 yd³
Step-by-step explanation:
The water reservoir is a rectangular solid that is a three dimensional shape with six quadrilateral faces (cuboid).
This reservoir has a base of 60 yards by 30 yards, and a vertical height of 30 yards. Therefore:
Volume of the reservoir = area of base * vertical height = 60 * 30 * 30 = 54000 yd³
This reservoir hence have a volume of 54000 yd³ when filled up with water.
After 3 months, the height of the water was down to 6 yards therefore the the volume is:
Volume after 3 months = area of base * vertical height = 60 * 30 * 6 = 10800 yd³
The amount of water used after 3 months = volume of water at beginning - volume of water after 3 months
The amount of water used after 3 months = 54000 - 10800 = 43200 yd³
I was to I was a couple months old .............
Answer:
Option C - Multiply the 1st equation by 2
Step-by-step explanation:
To find : Which step could be completed in order to prepare the system of equations below for the elimination method?
Solution :
1st equation:
2nd equation: ![8x+6y=15](https://tex.z-dn.net/?f=8x%2B6y%3D15)
For elimination method,
We eliminate the y by multiplying 1st equation by 2 and add by 2nd equation.
i.e. 1st equation became
Add with 2nd equation,
Substitute in (1),
![3y=\frac{175}{18}-10](https://tex.z-dn.net/?f=3y%3D%5Cfrac%7B175%7D%7B18%7D-10)
![3y=\frac{175-180}{18}](https://tex.z-dn.net/?f=3y%3D%5Cfrac%7B175-180%7D%7B18%7D)
![3y=\frac{-5}{18}](https://tex.z-dn.net/?f=3y%3D%5Cfrac%7B-5%7D%7B18%7D)
![y=\frac{-5}{54}](https://tex.z-dn.net/?f=y%3D%5Cfrac%7B-5%7D%7B54%7D)
Therefore, the step could be completed in order to prepare the system of equations below for the elimination method is option C.
Answer:
B
Step-by-step explanation:
3x2-3x5i-7ix2x7ix(-5i)
6-15i-14i+35i^2
6-15i-14i+35x(-1)
6-15i-14i-35