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shutvik [7]
3 years ago
7

If 20 articles cost ? 90, then the cost of 9 articles is ? ? 45 ? 4.50 ? 40.50 ? 42

Mathematics
1 answer:
lapo4ka [179]3 years ago
5 0

Answer:

40.50 is correct answer according to me

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Explain how Cavalieri’s principle can be used to find the volume of any solid.
Kruka [31]

Answer:

Cavalier's principle can be used to find the volume of any solid.

Step-by-step explanation:

Cavalier's Principle:

  • Cavalier introduced parallel planes and area to describe the relationship between solids.
  • Cavalier stated if two solids have the same height and equal areas of the base everywhere along the height then the solids have the same volume.
  • Suppose two regions are included between two parallel planes.
  • If every plane parallel to these two planes intersects both regions in cross-sections of equal area, then the two regions have equal volumes.
  • The formula for the volume of a prism is the area of the base times the height.
8 0
3 years ago
X+20≥-7 i need help pls lollllllllllllllllllllllllll
Zina [86]

Answer:

Step-by-step explanation:

x is greater or equal to 13

7 0
3 years ago
What is the median of the data set? <br> {10, 15, 14, 14, 10, 10, 8, 18, 11, 12, 17, 16}
Alexus [3.1K]
The median of a data set is the 'middle number'. You can find the median by listing the given numbers from least to greatest (left to right) and finding the middle number.

8, 10, 10, 10, 11, 12, 14, 14, 15, 16, 17, 18

Cross one out on each side before getting to your last number that should be in the middle. 

The middle numbers are: 12 and 14. If it was only one number, we could already have the answer, but since it is two numbers in the middle, we need to add them up and divide by 2. 

12 + 14 = 26
26 ÷ 2 = 13

So, the median of the data set is: 13.
6 0
3 years ago
4x-2y=-2<br> 3x+2y=-12<br><br> Solve by using elimination
andreyandreev [35.5K]
Point form: (-2,-3)
Equation form: x=-2, y=-3
7 0
3 years ago
PLEASE HELP WILL GIVE BRAINLIEST
Svetach [21]

Answer:

Check explanation

Step-by-step explanation:

I'll give you my way of solving it and you can figure it out from there.

<CEA = <DEB due to vertical angles

AE = ED due to midpoint theorem

<CAD = <ADB due to alternating angles theorem

thus two triangles congruent due to ASA

5 0
3 years ago
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