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posledela
2 years ago
6

PLs help!........................

Mathematics
1 answer:
larisa86 [58]2 years ago
7 0

Answer:

D

Step-by-step explanation:

7x + 28 < 84

     - 28  -28

7x < 56

÷7    ÷7    

x < 8

If it was a negative 7 the arrow would change direction

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12. The volume V of a gas varies inversely with the pressure P. When the volume is 75 inches cubed, the pressure is 30 pounds pe
charle [14.2K]

Answer:

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    V = k/P

 

where  k is a constant.  To find the value of k, plug in the one known point, V = 390 cubic inches when P = 7 pounds per square inch and solve for k:

 

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The full equation, then, is:

 

    V = 2730/P

 

To find the volume when P = 9 pounds per square inch:

 

    V = 2730/9 = _____ cubic inches

Step-by-step explanation:

Let V = the gas' volume and P = its pressure.  The volume of a gas in a container varies inversely with the pressure on the gas:

 

    V = k/P

 

where  k is a constant.  To find the value of k, plug in the one known point, V = 390 cubic inches when P = 7 pounds per square inch and solve for k:

 

    V = k/p

    390 = k/7

    390*7 = k

    2730 = k

 

The full equation, then, is:

 

    V = 2730/P

 

To find the volume when P = 9 pounds per square inch:

 

    V = 2730/9 = _____ cubic inches

5 0
3 years ago
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Anuta_ua [19.1K]

74.5

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Hope this helps!

6 0
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Answer:

Step-by-step explanation:

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3 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
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nydimaria [60]

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Step-by-step explanation:

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7 0
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