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3 years ago

Guys, please please help me

Mathematics

1 answer:

agasfer [191]3 years ago

5 0

Answer:

508.68

Step-by-step explanation:

Upper and lower surfaces of the cylinder:

$\pi r^{2} =9\pi \\S=2*9\pi =18\pi$

Side area of the cylinder:

$S=sh=\pi dh=6\pi *3*8=144\pi$

The total area:

$S=114\pi +18\pi =162\pi =162*3.14=508.68$

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Find BC if B(8, -7) and C(-4,-2)

Studentka2010 [4]

Answer:

13 unit

Step-by-step explanation:

By the distance formula,

The distance between two points $(x_1,y_1)$ and $(x_2, y_2)$ is,

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

Thus, the distance between B(8,-7) and C(-4,-2) is,

$BC=\sqrt{(-4-8)^2+(-2+7)^2}$

$=\sqrt{(-12)^2+(5)^2}$

$=\sqrt{144+25}$

$=\sqrt{169}$

$=13\text{ unit}$

3 0

3 years ago

Given: Q=7m + 3n, R= 11 - 2m, S= n + 5, and T= -m - 3n + 8 simplify R - [S + T]

Soloha48 [4]

R = 11-2m
S = n+5
T = -m-3n+8
---------------------------
Add up S and T to get...
S+T = (n+5)+(-m-3n+8)
S+T = n+5-m-3n+8
S+T = -m+(n-3n)+(5+8)
S+T = -m+(1n-3n)+(5+8)
S+T = -m+(-2n)+(13)
S+T = -m-2n+13
---------------------------
Subtract that result from R
R - [S + T]
11-2m - [-m-2n+13]
11-2m +m+2n-13
(-2m+m) + (2n) + (11-13)
(-2m+1m) + (2n) + (11-13)
(-1m) + (2n) + (-2)
-m + 2n - 2
---------------------------
---------------------------
The final answer is -m + 2n - 2

3 0

4 years ago

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Answer:

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