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3 years ago

Help me plz asap i need this

Mathematics

2 answers:

balu736 [363]3 years ago

6 0

Either it’s 28.26 or 28.27, I’m not really sure which one is right

Black_prince [1.1K]3 years ago

5 0

Answer:

circumference=28 in. after doing rounf off to the nearest hundredth

Step-by-step explanation:

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he volume of a cone of radius r and height h is one-third the volume of a cylinder with the same radius and height. Does the su

antoniya [11.8K]

Answer:

The surface area of a cone of radius r and height h not equal to one-third the surface area of a cylinder with the same radius and height.

Relationship is $S_c=(\frac{\sqrt{(r+h)}}{2h})S_C$

Step-by-step explanation:

Given : The volume of a cone of radius r and height h is one-third the volume of a cylinder with the same radius and height.

To find : Does the surface area of a cone of radius r and height h equal one-third the surface area of a cylinder with the same radius and height?

If not, find the correct relationship. Exclude the bases of the cone and cylinder.

Solution :

Radius of cone and cylinder is 'r'.

Height of cone and cylinder is 'h'.

The volume of cone is $V_c=\frac{1}{3}\pi r^2 h$

The volume of cylinder is $V_C=\pi r^2 h$

$\frac{V_c}{V_C}=\frac{\frac{1}{3}\pi r^2 h}{\pi r^2 h}$

$V_c=\frac{1}{3}V_C$

i.e. volume of cone is one-third of the volume of cylinder.

Now,

Surface area of the cone is $S_c=\pi r\sqrt{(r+h)}$

Surface area of the cylinder is $S_C=2\pi rh$

Dividing both the equations,

$\frac{S_c}{S_C}=\frac{\pi r\sqrt{(r+h)}}{2\pi rh}$

$\frac{S_c}{S_C}=\frac{\sqrt{(r+h)}}{2h}$

$S_c=(\frac{\sqrt{(r+h)}}{2h})S_C$

Which clearly means $S_c\neq \frac{1}{3}S_C$

i.e. The surface area of a cone of radius r and height h not equal to one-third the surface area of a cylinder with the same radius and height.

The relationship between them is

$S_c=(\frac{\sqrt{(r+h)}}{2h})S_C$

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3 years ago

Mary has nickels and dimes in her purse. She has a total of 30 coins worth $2.40. How many nickels does Mary have?

V125BC [204]

Answer:

72 nickels idk why she has so many

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4 years ago

(3x + 4)3<br> How is this written in expanded form?

Ludmilka [50]

9x+12

3(3x)+3(4) = 9x+12

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3 years ago

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if Sn is the nth partial sum of the harmonic series, show that e^Sn > n+1. Why does this imply that the harmonic series is di

yanalaym [24]

$S_n=\displaystyle\sum_{k=1}^n\frac1k$

You have

$\ln e^{S_n}=S_n\ln e=S_n$

so showing that $e^{S_n}>n+1$ amounts to the same as showing that $S_n>\ln(n+1)$ .

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3 years ago

A circle is cut from a square piece of cloth, as shown:

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