anonymous
  • anonymous
A building cast a shadow of 12 feet. At the same time a 3 feet yard stick held vertically cast a shadow of 4.5 inches. How tall is the building?
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Use ratios... height of object/length of shadow = height of other object/other length of it's shadow
anonymous
  • anonymous
ok, but I do not understand
anonymous
  • anonymous
Since you don't know height of building, let that be x.... so for building, ratio is x/12 for the other it would 3/4.5

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
So I multiply now
NY,NY
  • NY,NY
ya so now cross multiply
anonymous
  • anonymous
set those equal to each other and cross multiply
anonymous
  • anonymous
I am lost
NY,NY
  • NY,NY
you've got your ratios set up?
anonymous
  • anonymous
yes
NY,NY
  • NY,NY
ok so now cross multiply:
anonymous
  • anonymous
4.5x=36
NY,NY
  • NY,NY
hold on
anonymous
  • anonymous
ok
anonymous
  • anonymous
yes
anonymous
  • anonymous
then finish solving for x
anonymous
  • anonymous
Divide by 4.5
anonymous
  • anonymous
right
anonymous
  • anonymous
ok give me a sec
anonymous
  • anonymous
ok
anonymous
  • anonymous
I got 8ft tall
anonymous
  • anonymous
that's right!
NY,NY
  • NY,NY
well there you go!
anonymous
  • anonymous
Thanks so much
NY,NY
  • NY,NY
welcome
anonymous
  • anonymous
You're welcome :)
NY,NY
  • NY,NY
lol
anonymous
  • anonymous
You are good
NY,NY
  • NY,NY
ty
anonymous
  • anonymous
You like math
NY,NY
  • NY,NY
no i really dont
anonymous
  • anonymous
I do Haha
anonymous
  • anonymous
lol
NY,NY
  • NY,NY
hey you know anything bout radiation in Japan?
anonymous
  • anonymous
Can you help me with 1 more?
NY,NY
  • NY,NY
sure
anonymous
  • anonymous
Just from the news
NY,NY
  • NY,NY
its for my hw i need to know about the rafdiation stuff
anonymous
  • anonymous
A map uses a scale of 1 centimeter for each 5 kilometer
anonymous
  • anonymous
I can tell you what I have seen
anonymous
  • anonymous
If the distance on a map from City A to city B is 17.5 cm
anonymous
  • anonymous
what is the distance between the cities in kilometers
anonymous
  • anonymous
and in miles
NY,NY
  • NY,NY
well i dont know about miles
NY,NY
  • NY,NY
but i can help you with the other thing
anonymous
  • anonymous
There are 2.54 cm in 1 inch and 5280 ft in 1 mile
anonymous
  • anonymous
ok, thanks
NY,NY
  • NY,NY
so you know that for eveery centimeter it is equal to 5 kilometers
anonymous
  • anonymous
What do you need to know about the radiation?
anonymous
  • anonymous
yes
NY,NY
  • NY,NY
w8 lemme help you with your stuff then you tell me radiation blah blah
anonymous
  • anonymous
Use ratios again.... cm/km = cm/km or 1/5 = 17.5 cm/x
anonymous
  • anonymous
ok
anonymous
  • anonymous
then cross multiply
NY,NY
  • NY,NY
yup exactly what he/she said
anonymous
  • anonymous
She :)
NY,NY
  • NY,NY
oh ok lol
anonymous
  • anonymous
would 1/5 be over 1
anonymous
  • anonymous
no, just leave it as 1/5
anonymous
  • anonymous
How can it be cross multiplied?
anonymous
  • anonymous
1 * x = 5 * 17.5
NY,NY
  • NY,NY
yea
anonymous
  • anonymous
85
anonymous
  • anonymous
I meant 87.5
anonymous
  • anonymous
Yes, 87.5 km
NY,NY
  • NY,NY
lol 64 replies!!!!!!!!!!
NY,NY
  • NY,NY
65
anonymous
  • anonymous
to this question
anonymous
  • anonymous
Ha!
anonymous
  • anonymous
Now to convert 87.5 km to miles?
anonymous
  • anonymous
Convert km to cm, then cm to inches, inches to feet, and feet to miles
anonymous
  • anonymous
I am not good with geometry
anonymous
  • anonymous
there are 1000 meters in one km, so first multiply by 1000
anonymous
  • anonymous
Will that -= the miles
anonymous
  • anonymous
this means 87.5 km = 87,500 m..... then, there are 100 cm in a meter, so mulitply the above answer by 100 and you'll have the answer in centimeters
anonymous
  • anonymous
so it's 8,750,000 cm
anonymous
  • anonymous
we would g through all the steps to get to the miles, correct?
anonymous
  • anonymous
yes, from cm, you would convert to get inches, then with inches you can get feet, and then feet to miles
anonymous
  • anonymous
You have to be careful though. There are 2.54 cm in 1 inch, so this time you DIVIDE by 2.54
anonymous
  • anonymous
ok
anonymous
  • anonymous
36 inches in 1 ft, so DIVIDE by 36
anonymous
  • anonymous
You would divide 8,750,000 by 36?
anonymous
  • anonymous
no, divide by 2.54 first
anonymous
  • anonymous
ok
anonymous
  • anonymous
then that answer by 36
anonymous
  • anonymous
95691 miles
anonymous
  • anonymous
then last step, 5280 ft in a mile
anonymous
  • anonymous
yes, but don't round the answer until you have divided by 5280
anonymous
  • anonymous
and round answer to however many decimal places you need
anonymous
  • anonymous
I got 18.12 miles
anonymous
  • anonymous
Correct!
anonymous
  • anonymous
Thanks
anonymous
  • anonymous
Hmmmm, that doesn't sound right....let me double check my work :)
anonymous
  • anonymous
NO, that IS right...I was thinking about something else...Sorry :)
anonymous
  • anonymous
ok
anonymous
  • anonymous
Haha, I'm confusing myself....let me check that
anonymous
  • anonymous
I messed you up....so, sorry....there are 12 inches in a foot....OOPS
anonymous
  • anonymous
we used 36.....sorry about that
anonymous
  • anonymous
The radiation in Japan has traveled to some parts of the U.S, through the water. The amount that is in seafood, they say is small, but a lot of places has stopped selling things like fish.
anonymous
  • anonymous
ok, how far do I go back?
anonymous
  • anonymous
we worked it right, just used the wrong number there....i apologize. Go back to where we divided by 36....that should have been 12
anonymous
  • anonymous
I am trying to scroll up
NY,NY
  • NY,NY
we're gonna make the world record for most replies on open study
anonymous
  • anonymous
87.5 * 1000 * 100 ....then take that answer and divide by 2.54, then divide by 12, then divide by 5280
anonymous
  • anonymous
Ok, doing that now, did you see my response abt the radiation?
anonymous
  • anonymous
I got 54.37 miles
anonymous
  • anonymous
Yes, that is correct....AND that answer makes sense LOL Sorry about the other. It's right now :)
NY,NY
  • NY,NY
oh i didnt notice that thank you!
anonymous
  • anonymous
Thanks
anonymous
  • anonymous
You're welcome...I'll let y'all chat about Japan now :)
anonymous
  • anonymous
A lot of people has been diagnosed with radiation, and some are bad
anonymous
  • anonymous
Thanks so much
NY,NY
  • NY,NY
hey you know where you got that info like what was the news channel?
anonymous
  • anonymous
It was my local news.
anonymous
  • anonymous
I bet you can get more information on-line
anonymous
  • anonymous
maybe type in radiation in Japan
NY,NY
  • NY,NY
yea im on this BBC News website but i want to use the information you said but i have to name the source of information
anonymous
  • anonymous
I know it is ABCnews.com
anonymous
  • anonymous
I am checking to make sure it is correct
anonymous
  • anonymous
I am here seeing if I can post the link
NY,NY
  • NY,NY
wait i got it
anonymous
  • anonymous
Radiation found in Japan's food, water - Washington Times Mar 20, 2011 ... Fears of nuclear fallout grew during a wet Sunday after officials reported traces of radioactive elements in milk, spinach, water and rain ... http://www.washingtontimes.com/news/2011/mar/20/radiation-found-in-japans-food-water/
NY,NY
  • NY,NY
no waIT no
anonymous
  • anonymous
ok, great
anonymous
  • anonymous
Wait that one is not local
NY,NY
  • NY,NY
thank you
anonymous
  • anonymous
that was nt about it being in the U.S. was it?
NY,NY
  • NY,NY
um no it's about radiation in thje food and water
anonymous
  • anonymous
Darn, my page all scrambled, i am tying to clear it
anonymous
  • anonymous
ok
anonymous
  • anonymous
Japan Radiation: U.S. Seafood Test Fish at Los Angeles wholesaler tested for possible radiation leaked from Japan. Apr 07, 2011 07:42 AM Video from GMA ABC News
anonymous
  • anonymous
Is that ok
anonymous
  • anonymous
Hello
NY,NY
  • NY,NY
yes
anonymous
  • anonymous
ok, great
NY,NY
  • NY,NY
ty
anonymous
  • anonymous
Thanks for your help today and it was nice to meet you
NY,NY
  • NY,NY
you too
NY,NY
  • NY,NY
could you fan me?
anonymous
  • anonymous
I do not know how to
NY,NY
  • NY,NY
it says become a fan next to my name
anonymous
  • anonymous
Where, I do not see it
NY,NY
  • NY,NY
Where it says NY,NY it says star (11 fans next to that it says become a fan
anonymous
  • anonymous
It does not say that on my screen
anonymous
  • anonymous
I see everything except become a fan
NY,NY
  • NY,NY
but it should there is a thumbs up picture and nexto it it says Become a fan
anonymous
  • anonymous
The thumbs up is not there
anonymous
  • anonymous
Are you still here
NY,NY
  • NY,NY
yes sorry
anonymous
  • anonymous
Thats ok, if I attache a file can you see it
anonymous
  • anonymous
It has my homework on it and it is geometry, I am about to fail it and ned help
anonymous
  • anonymous
need
NY,NY
  • NY,NY
um w8 im sorry im doing homework
anonymous
  • anonymous
I am about to get back to my work as well. thanks for all your help
NY,NY
  • NY,NY
your very welcome
NY,NY
  • NY,NY
will you stay online ?
NY,NY
  • NY,NY
ltkrlkmh;kjdhjej kheeetj kjer;k;byet
radar
  • radar
Did you consider inches vs feet for the original building? An 8 ft high building sounds kind of short!
NY,NY
  • NY,NY
uh radar, you do understand this question is from 6 DAYS AGO?????????
radar
  • radar
NY,NY, I like to look at the problems and the answers for my own edification, I learn a lot that way. In the problem, the original problem, you were given that a building of unknown height cast a shadow of 12 ft. At the same a yard stick cast as shadow of 4.5 inches. The solution that you and your help worked out was the building was 8 ft tall. Kinda short don't you think. It was agreed that this was a ratio problem and one of the proportion was x/12 which I find agreeable. The other proportion 3/4.5 Huh??? That was the flaw . The units are ft vs in, while it should be 36/4.5 as the 4.5 is in inches. x/12::36/4.5 Gives a height of 96 ft. Do you agree?
NY,NY
  • NY,NY
hmmm ya i didnt notice 8 ft didnt sound right maybe you are correct? well any way its a good thing cdunn didnt fan me cuz i could have been wrong!
NY,NY
  • NY,NY
but if it is feet to inches then isnt it 3 ft: 4.5 in? where does 36 come from?
radar
  • radar
3 ft is 3 *12 = 36 in.
radar
  • radar
The 3 ft yardstick cast a shadow of 4.5 inches.
anonymous
  • anonymous
Radar, you are correct. I completely overlooked that when I was working that problem.
NY,NY
  • NY,NY
oh! lol
radar
  • radar
Math93, I just fanned you, you're a good sport, I realize this was a old problem, but old enough that we couldn't learn from it.

Looking for something else?

Not the answer you are looking for? Search for more explanations.