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3 years ago

9

I don’t know this one

2 answers:

torisob [31]3 years ago

5 0

Answer:

3077.2

Step-by-step explanation:

A circle's mass is found by

Pie times R^2

7^2 is 49, times 3.14 is 153.86

then you Multiply 153.86 by 20 which gives you 3077.2

Alexxx [7]3 years ago

5 0

Volume of a cylinder = pi r^2 * h
Pi 7^2 * 20
Volume = 49 pi

Density = mass/ volume
2.5= mass/ 49 pi
Mass= density * volume
= 2.5*49 pi
= 245/2 pi
= 384.845...
=384.8 g to 1 dp

Answer= Volume

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¿Cómo es esto?, Plisssssssssss ayuda

mel-nik [20]

Answer

I think it is number 5

Step-by-step explanation:

6 0

3 years ago

a. Find symmetric equations for the line that passes through the point (4, −4, 8) and is parallel to the vector −1, 4, −3b. Find

daser333 [38]

The line has equation

$\vec r(t)=(4,-4,8)+(-1,4,-3)t$

where $t$ is any real number. $(-1,4,-3)t$ is the line containing all scalar multiples of the vector (-1, 4, -3); we add (4, -4, 8) to shift the line so that it passes through this point while remaining parallel to the the line.

To get the symmetric form, we have

$\begin{cases}x(t)=4-t\\y(t)=-4+4t\\z(t)=8-3t\end{cases}$

Solving for $t$ in each equation gives the symmetric form,

$t=\boxed{4-x=\dfrac{y+4}4=\dfrac{8-z}3}$

The line has intercepts in the coordinate planes wherever either the $x$ , $y$ , or $z$ coordinate is 0.

$xy$ -plane:

$z=0\implies\begin{cases}4-x=\frac83\\\frac{y+4}4=\frac83\end{cases}\implies\left(\dfrac43,\dfrac{20}3,0\right)$

$yz$ -plane:

$x=0\implies\begin{cases}\frac{y+4}4=4\\\frac{8-z}3=4\end{cases}\implies\left(0,12,-4\right)$

$xz$ -plane:

$y=0\implies\begin{cases}4-x=1\\\frac{8-z}3=1\end{cases}\implies\left(3,0,5\right)$

7 0

3 years ago

I don’t know how to do this

Jet001 [13]

Use proportions because we know that the triangles are similar.

$\frac{20}{28}=\frac{5}{x}$

Cross multiply.

20x=28×5

x=7

answer: 7

6 0

3 years ago

7 people are having dinner at a restaurant and decide to split the cheque evenly between them. If the check came to a total of $

DanielleElmas [232]

Answer:

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Step-by-step explanation:

If 7 people slit $381.50 evenly, we will have

$381.50/7 = $54.5

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3 years ago

If I subtract the square of one integer from the square of another, the difference could be

SIZIF [17.4K]

Answer:

The answer is C

Step-by-step explanation:

3 0

3 years ago