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jok3333 [9.3K]
3 years ago
9

Which of the following has 20 faces?

Mathematics
2 answers:
Vedmedyk [2.9K]3 years ago
5 0

D. Icosahedron

<span>In geometry, an icosahedron is a polyhedron with 20 faces. </span>

choli [55]3 years ago
4 0
It’s D. Icosahedron has 20 faces.
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The ubiquitous 12oz aluminum cans used to distribute drinks in this country have a diameter of approximately 2.75 inches and a h
gayaneshka [121]

Answer:

3.5%

Step-by-step explanation:

The volume of a cylinder = \pi r^2h

<em>r</em> = radius of cylinder,

<em>h</em> = height of cylinder

For the non-optimal can,

<em>r</em> = 2.75/2 = 1.375

<em>h</em> = 5.0

V = \pi(1.375^2)\times 5.0 = 9.453125\pi

<em />

For the optimal can,

<em>d</em>/<em>h</em> = 1,

<em>d</em> = <em>h</em>

2<em>r </em>=<em> h</em>

<em>r</em> = h/2

V = \pi\left(\dfrac{h}{2}\right)^2\times h = \pi\left(\dfrac{h^3}{4}\right)

They have the same volume.

<em />\pi\dfrac{h^3}{4} = 9.453125\pi<em />

h^3 = 37.8125

h=3.36 (This is the height of the optimal can)

r = \dfrac{3.36}{2} = 1.68 (This is the radius of the optimal can)

The area of a cylinder is

<em />A = 2\pi r(r+h)<em />

For the non-optimal can,

A = 2\pi\times\dfrac{2.75}{2}\left(\dfrac{2.75}{2}+5.0\right) = 17.53125\pi

For the optimal can,

A = 2\pi\times1.68\left(1.68+3.36\right) = 16.9344\pi

Amount of aluminum saved, as a percentage of the amount used to make the optimal cans = \dfrac{17.53125\pi - 16.9344\pi}{16.9344\pi}\times 100\% = 3.5\%

5 0
4 years ago
Joan Sara Sam and Tom each have 4 baseball cards how many baseball cards do they have in all
Bingel [31]

Answer:

12.

Step-by-step explanation:

4 cards by 3 people 12 cards in total.

3 0
4 years ago
Read 2 more answers
!!!WILL MARK BRAINLIEST IF CORRECT AND ALL PARTS OF THE QUESTION ANSWERED!!!!
tester [92]
(a) The dimensions of the base of the box are (8 -2x) and (10 -2x). The depth of the box is x. The volume is the product of these dimensions.
  V = x(8 -2x)(10 -2x)

(b) A graphing calculator is suitable "technology". The process is ...
• write the equation in the calculator
• adjust the scaling so the curve fills the display area
• select the maximum point to reveal its coordinates

The value of x that maximizes box volume is about 1.5 inches.

3 0
3 years ago
Factor and solve x2 + 7x - 30 = 0. What are the solutions?
MA_775_DIABLO [31]
(x+10)(x-3). I’m assuming you meant x^2
4 0
3 years ago
Read 2 more answers
Decide whether 3(x-2)+5 and 3x+1 are equivalent expressions. explain how you know.
OlgaM077 [116]

Answer:

Not equivalent

Step-by-step explanation:

Let,

3(x-2) + 5 = 3x + 1

By Multiplying

3x - 6 + 5 = 3x + 1

3x - 1 = 3x + 1

So, the expressions are not equal

4 0
3 years ago
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