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Law Incorporation [45]
3 years ago
15

2 times the sum of a number and 5 is 20

Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
8 0

The number is 5. Steps shown below

pishuonlain [190]3 years ago
6 0

2(x+5)=20\\ \\ 2x+10=20\\ \\ 2x=20-10\\ \\ 2x=10\\ \\ x=5

Confirming the other answer. 5 is correct.

Hope this helps!

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The gas tank on the back of a tanker truck can be equated to a cylinder with a diameter of 8 feet and a length of 19 feet. A gal
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9514 1404 393

Answer:

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  • farmer's tank: 12,811 lb

Step-by-step explanation:

The formula for the volume of a cylinder is ...

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The radius of the driver's tank is half its diameter, so is (8 ft)/2 = 4 ft. Then the volume of that tank is ...

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Then the total mass in the driver's full tank is ...

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__

The farmer's tank is a scaled-down version of the driver's tank. It's volume will be scaled by the cube of the linear scale factor, so will be (2/3)^3 = 8/27 of the volume of the driver's tank.

The farmer's tank will hold a mass of (43,238.3 lb)(8/27) ≈ 12,811 lb.

The amount remaining in the driver's tank is 43,238 -12,811 = 30,427 lb.

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