3D figures volume.. @jim_thompson5910

Question

anonymous · Answer

attachment

anonymous · Answer

could you help me please @jim_thompson5910? sorry

anonymous · Answer

If all the dimensions of the second box is scaled down by 1/2 then the volume is 2*5*1.5 = 15

anonymous · Answer

so the answer is 15?

anonymous · Answer

That is my guess.

anonymous · Answer

The word "is" in my response should have been "are".

anonymous · Answer

@robtobey oh okay  i see hmm how about this one?

jim_thompson5910 · Answer

the ratio of the two radii is 5/2 = 2.5

So the volume of the larger cylinder will be (2.5)^3 = 15.625 times greater than the smaller cylinder

anonymous · Answer

so i multiply that by 88 correct?

jim_thompson5910 · Answer

yes

anonymous · Answer

i got 1,375

jim_thompson5910 · Answer

same here

anonymous · Answer

attachment

jim_thompson5910 · Answer

what's the ratio of the corresponding sides

anonymous · Answer

2/5 = 0.4

anonymous · Answer

or 5/2 = 2.5

jim_thompson5910 · Answer

you're going from small volume (known) to big volume (unknown)

so the ratio will be larger than 1

jim_thompson5910 · Answer

so the ratio is 5/2 = 2.5

jim_thompson5910 · Answer

cube this ratio to get 2.5^3 = 15.625

now multiply this with the smaller volume to get the larger volume

anonymous · Answer

I got 31.25

jim_thompson5910 · Answer

smaller volume is 30

larger volume = (scale factor) * (smaller volume)

larger volume = (15.625) * (30)

larger volume = 468.75

anonymous · Answer

468.75 yeah oops i did it wrong before

anonymous · Answer

i did the 2 cm instead of the volume of 30 what a dumby lol

jim_thompson5910 · Answer

you're fine, no worries, silly mistake

anonymous · Answer

think i've got this one but need a bit of help

anonymous · Answer

ratio is 4/2 = 2

jim_thompson5910 · Answer

cube that to get ???

anonymous · Answer

how do i cube ?

jim_thompson5910 · Answer

2^3 = 8

jim_thompson5910 · Answer

so you divide the larger volume by 8 to get the smaller volume

anonymous · Answer

i've gotten 2,816

jim_thompson5910 · Answer

you're going from big volume (known) to small volume (unknown)

jim_thompson5910 · Answer

so you divide by the scale factor

anonymous · Answer

I multiplied oops okay 44

jim_thompson5910 · Answer

44 is correct

anonymous · Answer

thanks :) i knew i shouldn't of waited til the last minute i'm really behind in math and i end school june 6th silly me

jim_thompson5910 · Answer

i get like that too sometimes, but it's a very bad habit since there's so much to do in so little time