Question

Please help.

Answer 1

Questions here.

Answer 2

ok

Answer 3

u got another medal

Answer 4

ok :)

Answer 5

thats still good grade

Answer 6

wich ones u get wrong

Answer 7

First let's find the volume of the cone...
\[Volume ~of ~a ~cone = \pi*r^2 *\frac{ h }{ 3 }\]
Can you plug in the radius and height? :)

Answer 8

kami

Answer 9

Yash

Answer 10

i already helped him in massages lol but ty ill give u medal

Answer 11

Oh, lol. xD
Thanks:)

Answer 12

lol

Answer 13

Kiity i got em all wrong lol.

Answer 14

how

Answer 15

it says i got them wrong lol

Answer 16

retry ill give all write post all in comment

Answer 17

60000 @KamiBug

Answer 18

??

Answer 19

Show your steps? :P

Answer 20

300*200=60000

Answer 21

Eek, you gotta use the formula I put up there ^^^ XD

Answer 22

300*200*1/3=20000? lol

Answer 23

\[V = 3.14*150*\frac{ 200 }{ 3 }\]
pi = 3.14
r = half the diameter (300/2=150)
h(height) = 200

Answer 24

oh ok i understand

Answer 25

*** 300*200*1/3=20000? lol***
that is close

but you want the radius (not the diameter). the diameter is 300. the radius is only ½ of that

also, you should put in pi. pi is about 3.14

Answer 26

is that the answer?

Answer 27

or just the formula?

Answer 28

Thats the formula for the cone. After solving that we need to find the volume of the half sphere on top.

Answer 29

you are finding the volume of the cone
you also have to find the volume of the "half sphere"
that is a different formula

you then add up the volume of the cone and the one-half sphere

Answer 30

ok cool.

Answer 31

So what do you get for the volume of the cone after simplifying what we plugged in? :)

Answer 32

i got 31400 lol

Answer 33

Looks good. :) Now, how do you think we can find the volume of the figure on top of the cone?

Answer 34

hmm idk could u explain lol

Answer 35

Well it's half of a sphere right ? So we can use the formula for the volume of a sphere and then divide what we get by 2.
Do you know what the formula is? ^.^

Answer 36

ok cool.

Answer 37

oh srry in back

Answer 38

btw, the formula for the volume of the cone is
\[ V= \frac{1}{3} \pi r^2 \ h\]
notice is has r^2 (r squared) or r*r
not just r

so you should re-do that part.

Answer 39

Oh, that's my bad! I left out the '^2' in the formula...! Sorry @TylerMckinney16 So the final volume for the cone would actually be 4,710,000 ^_^

Answer 40

Thank you! @phi

Answer 41

Ok now what ? :)

Answer 42

Now we find the volume of the half sphere ^,^ You know the formula for that?

Answer 43

Could you put the formula.

Answer 44

\[V = \frac{ 2 }{ 3 }*\pi*r^3\]

Answer 45

sweet :) ill do it right now

Answer 46

Great :D

Answer 47

300*200*2/3=40000??

Answer 48

tyler

Answer 49

You forgot pi (3.14). ^.^
Remember the radius is 150, not 300. :) And you need to cube it...150^3
Also, the formula doesn't ask for the 200...that's the height of the cone. :P
\[V = 150^3 * 3.14 * \frac{ 2 }{ 3 }\]

Answer 50

hello

Answer 51

ok 2/3*3.14*150^3=7065000??? is this good.

Answer 52

Yup, perfect!

Answer 53

Now we add that to our other volume...
7,065,000 + 4,710,000 = ?

Answer 54

11.775

Answer 55

Right, 11,775,000.
Hmm...looks like I must have made a mistake somewhere along the way bc it's not one of the answer choices...A is the closest though. :o

Answer 56

Yeah lol.

Answer 57

@Zarkon What do you think?

Answer 58

use more digits of \(\pi\)

Answer 59

using the value of \(\pi\) on my calculator I get 11,780,972.451

Answer 60

Oh, okay! Good idea. ^.^ So the fraction 22/7 would be better right? :)

Answer 61

I used 3.14159265359

Answer 62

Okay :D @TylerMckinney16
There's your answer. :3

Answer 63

sweet thanks :D