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sergey [27]
3 years ago
5

What is the volume of a cylinder? Give an informal argument for the formula.

Mathematics
2 answers:
aleksandrvk [35]3 years ago
7 0

V = πr^2h; A cylinder is like a stack of circles, so it's the area of the circles times the height.

gavmur [86]3 years ago
6 0

Answer:

V = πr^{2}h

Step-by-step explanation:

The volume is the area base multiplied by the height of the cylinder. It is like a stack of circles, so it's the area of the circles times the height.

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Annita, Gary, and Tara all run races. Annita has 7 less than 4 times the number of race medals as Tara. Gary has 13 more than 2
harkovskaia [24]

Answer:

4 t - 7  = 2 t+ 13  is the required equation.

The number of race medals Tara has is t = 20 medals.

Step-by-step explanation:

Let the number of medals Tara has = t medals

So, the number of medal Anita has  = 4( Medals of Tara) - 7

= 4t - 7

And the number of medals Gary has = 2 times (Medals of Tara) + 13

= 2(t)  + 13  = 2t + 13

Now, Annita and Gary has same number of medals.

⇒  4t - 7  = 2t+ 13

or, 4t - 2t  = 7 + 13

⇒ 2t  = 20

⇒ t = 20/2 = 10

or t = 10

Hence, the number of race medals Tara has is t = 20 medals

6 0
3 years ago
Christian randomly selects students from his grade to rate a math test as easy, moderate, or difficult. Of the students he surve
IRINA_888 [86]

Answer:

84

Step-by-step explanation:

Total students he surveyed: 27

Amount that found it something OTHER than easy: 14 (11 moderate + 3 difficult)

This means that \frac{14}{27} found it something other than easy

Multiply that by 162 to find the proportion for the larger population:

162 * (14/27), and we get 84.

4 0
2 years ago
Please help i will give brainlyest i promise
oksian1 [2.3K]

Answer:

the fist one

Step-by-step explanation:

8 0
3 years ago
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Natalia is making a model of a statue using a scale in which 7 centimeter equals 4 feet. If the model is 3.5 centimeters wide, w
Serhud [2]

Answer:

2 ft

Step-by-step explanation:

\dfrac{7}{4} = \dfrac{3.5}{x}

7x = 4 \times 3.5

x = 2

Answer: 2 ft

7 0
3 years ago
What number is represented here?
zloy xaker [14]
The missing number is 15. .
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3 years ago
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