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Amanda [17]
4 years ago
10

Help I don’t understand

Mathematics
1 answer:
OverLord2011 [107]4 years ago
8 0
Rotation about a point does not change any dimensions. C'D' = CD = 2.8 units.
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A solid metal cube of side 1-2 cm has a mass of 15 grams.
sashaice [31]

Answer:

The mass of the second cube is about 1085.07 grams.

Step-by-step explanation:

I assume '1-2 cm' means 1.2cm here. Correct me if I am wrong and I'll edit my answer.

First, find the density of this cube:

d=\frac{m}{v}

where d is density, m is mass, and v is volume.

We have one of those, but we also need volume. The volume of a cube is just:

v=a^3

where a is the length of a side.

\rightarrow v=1.2^3\\\rightarrow v=1.728

The volume of this cube is 1.728cm³. Now, you can find the density;

\rightarrow d=\frac{15}{1.728}\\\rightarrow d\approx8.6806

The density of this material is about 8.68 grams per cubic centimeter.

Finally, you can use that density to find the mass of the other cube. Fin the volume of the second cube:

\rightarrow v=5^3\\\rightarrow v=125

The volume is 125cm³. Given the density and the volume, you can calculate the mass:

\rightarrow d=\frac{m}{v}\\\rightarrow 8.6806=\frac{m}{125}\\\rightarrow 8.6806\times125=m\\\rightarrow m=1085.0694

The mass of the second cube is about 1085.07 grams.

4 0
3 years ago
A cone with a radius 2 units is shown below. Its volume is 29 cubic units. Find the height of the cone
rusak2 [61]

Answer:

The height of the cone is 6.9\ units

Step-by-step explanation:

we know that

The volume of the cone is equal to

V=\frac{1}{3}Bh

where

B is the area of the circular base of the cone

h is the height of the cone

In this problem we have

V=29\ units^{3}

r=2\ units

<em>Find the area of the base B</em>

B=\pi r^{2}

substitute the value of r

B=\pi (2)^{2}=4 \pi\ units^{2}

<em>Find the height of the cone</em>

29=\frac{1}{3}(4 \pi)h

h=29*3/(4 \pi)

assume \pi=3.14

h=29*3/(4*3.14)=6.9\ units

7 0
3 years ago
3n-8+2(5n+3)=8n+5+4n
DaniilM [7]
<span>3n-8+2(5n+3)=8n+5+4n first I will do the multiplication
3n-8+10n+6=8n+5+4n Now I will simplify
13n -2 = 12n +5 Now I will add 2 to both sides
13n = 12n + 7 then I subtract 12n from both sides
n = 7</span>
7 0
4 years ago
Read 2 more answers
Please explain and tell me how to do it please
Eduardwww [97]
(x,y) order. Point A is facing 5 where y is so it would 5 because Point A is across the y -axis.
3 0
4 years ago
I need the answer explained
Rom4ik [11]

Answer:

1.33

Step-by-step explanation:

62 can only be subtracted from 82 once. So 82.46-62 would be 20.46. Since you can't subtract anymore you put a decimal point. 62x3=186 and 20.46-186=1.86 and you can subtract 186-186=0.

8 0
3 years ago
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