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Mathematics 9 Online
OpenStudy (sarahc):

A snow cone is a tasty treat with flavored ice and a spherical bubble gum ball at the bottom. The radius of the cone is 1.75 inches, and its height is 3.5 inches. If the diameter of the bubble gum ball is 0.5 inches, what is the closest approximation of the volume of the cone that can be filled with flavored ice? 11.15 in3 11.22 in3 0.07 in3 33.67 in3

OpenStudy (sarahc):

OpenStudy (sarahc):

@jim_thompson5910 need some help :)

jimthompson5910 (jim_thompson5910):

Alright the basic idea here is to find the volume of empty space inside the cone. How do we do this (any ideas)?

OpenStudy (sarahc):

errr to find the volume of a cone you would use v=1/3pir^2h

jimthompson5910 (jim_thompson5910):

you are correct

jimthompson5910 (jim_thompson5910):

So the volume of the cone is ...???

OpenStudy (hba):

Since we're "filling" a shape and looking in 3 dimensions, we have to find the volume of the two shapes. If you find the volume of the cone and subtract the volume of the ball from it, that's what's left to fill with ice.

OpenStudy (sarahc):

b?

jimthompson5910 (jim_thompson5910):

that's the volume of the cone...but...there's a small sphere inside the cone that doesn't count

jimthompson5910 (jim_thompson5910):

So you have to subtract off that small bit of volume

OpenStudy (sarahc):

a

jimthompson5910 (jim_thompson5910):

good, you nailed it

OpenStudy (hba):

right

jimthompson5910 (jim_thompson5910):

A is the correct answer

OpenStudy (sarahc):

thanks guys!

jimthompson5910 (jim_thompson5910):

you're welcome

OpenStudy (sarahc):

Ally is wearing a witch’s costume for Halloween. Her hat is in the shape of a cone with a diameter of 9 inches and a height of 14 inches. What is the volume of Ally’s hat? Use 22/7 for pi. 382 in3 297 in3 1,188 in3 891 in3

OpenStudy (sarahc):

b?

jimthompson5910 (jim_thompson5910):

you are correct

OpenStudy (sarahc):

The funnel has a diameter of 1.38 inches that includes a wall that is 0.125 inches thick. What is the maximum volume of the funnel? 1.19 in3 1.78 in3 0.76 in3 3.57 in3

OpenStudy (sarahc):

b ?

jimthompson5910 (jim_thompson5910):

well if you're including the thickness of the cone, then B is correct

OpenStudy (sarahc):

ugh i got it wrong:/

jimthompson5910 (jim_thompson5910):

hmm well if you include the thickness, then you get 0.584833 roughly...but that's not an answer choice...one sec

jimthompson5910 (jim_thompson5910):

oops meant exclude the thickness

OpenStudy (sarahc):

yeah :( darn. its okay only one problem!

jimthompson5910 (jim_thompson5910):

are you able to redo it?

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