Mathematics
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OpenStudy (anonymous):
plz help check my answer!
Pyramid A is a square pyramid with a base side length of 9 inches and a height of 10 inches. Pyramid B has a volume of 1350 cubic inches. How many times bigger is the volume of pyramid B than pyramid A? Give your answer as a percent. Provide an explanation and proof for your answer to receive full credit.
is it 45%
12 years ago
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OpenStudy (anonymous):
is it 45%
12 years ago
OpenStudy (anonymous):
@phi
@ganeshie8
@mathstudent55
@jdoe0001
@thomaster
12 years ago
OpenStudy (anonymous):
@zzr0ck3r
12 years ago
jimthompson5910 (jim_thompson5910):
What is the volume of pyramid A?
What is the volume of pyramid B?
12 years ago
OpenStudy (anonymous):
pyramid b is shown and a is 30 @jim_thompson5910
12 years ago
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jimthompson5910 (jim_thompson5910):
B is shown?
12 years ago
OpenStudy (anonymous):
yes its 1350
12 years ago
jimthompson5910 (jim_thompson5910):
pyramid A is incorrect
12 years ago
OpenStudy (anonymous):
why? can u explain
12 years ago
jimthompson5910 (jim_thompson5910):
did you use the formula
V = (1/3)*s^2*h
?
12 years ago
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OpenStudy (anonymous):
yes
12 years ago
jimthompson5910 (jim_thompson5910):
what did you use for s and h?
12 years ago
OpenStudy (anonymous):
9 and 10
12 years ago
jimthompson5910 (jim_thompson5910):
V = (1/3)*s^2*h
V = (1/3)*9^2*10
V = ??
12 years ago
OpenStudy (anonymous):
oops this time i got 27
12 years ago
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jimthompson5910 (jim_thompson5910):
close
12 years ago
OpenStudy (anonymous):
?
12 years ago
OpenStudy (anonymous):
i got 27.00
12 years ago
jimthompson5910 (jim_thompson5910):
that's incorrect, but close
12 years ago
OpenStudy (anonymous):
i did 81 times 10 times 1/3
12 years ago
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OpenStudy (anonymous):
now i got 270 is that right
12 years ago
jimthompson5910 (jim_thompson5910):
pyramid A: 270
pyramid B: 1350
12 years ago
OpenStudy (anonymous):
ok
12 years ago
OpenStudy (anonymous):
i got 5.00 when i divided them
12 years ago
OpenStudy (anonymous):
am i supposed to do that?
12 years ago
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jimthompson5910 (jim_thompson5910):
So B is 500% times bigger
12 years ago
jimthompson5910 (jim_thompson5910):
actually, hmm let me think for a second
12 years ago
OpenStudy (anonymous):
? wouldn't it be 5%
12 years ago
OpenStudy (anonymous):
or is it 20%
12 years ago
OpenStudy (anonymous):
@jim_thompson5910 u there
12 years ago
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jimthompson5910 (jim_thompson5910):
are you given a list of choices?
12 years ago
OpenStudy (anonymous):
nope
12 years ago
jimthompson5910 (jim_thompson5910):
well since it's 5 times bigger, and 5 = 500%, that's why I'm thinking 500%
12 years ago
OpenStudy (anonymous):
thx
12 years ago