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valina [46]
3 years ago
8

Which is best estimate of each percent? 21/ of 387?

Mathematics
1 answer:
Phoenix [80]3 years ago
3 0
81.27 is the answer to 21% of 387 so a good estimate would be 82
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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:

  • driver's tank: 30,427 lb
  • farmer's tank: 12,811 lb

Step-by-step explanation:

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

  V = πr^2·h . . . radius r, height h

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 ...

  V = π(4 ft)^2·(19 ft) = 304π ft^3

Each cubic foot of gasoline has a mass of ...

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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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3 years ago
Math help! Is this correct? If not what’s the real answer
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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In an auditorium, a charity show is conducted in order to raise at least $3,750. The auditorium can accommodate up to 180 specta
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Answer:

See explanation

Step-by-step explanation:

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Total cost of all tickets is $(15x + 25y).

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15x+25y\ge 3,750

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x+y\le 180

3. We get the system of inequalities:

\left\{\begin{array}{l}x\ge 0\\y\ge 0\\x+y\le 180\\15x+25y\ge 3,750\end{array}\right.

Plot all solutions sets to each inequality and the common region is the solution set to the system of inequalities. This region is not empty, so the charity will reach its goal. For example, if they sell 50 students tickets and 125 adult tickets, they will raise \$(15\cdot 50+25\cdot 125)=\$3,875

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3 years ago
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Mariana [72]

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a theory of matter and energy based on the concept of quanta, especially quantum mechanics.

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