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Use ratios... height of object/length of shadow = height of other object/other length of it's shadow
ok, but I do not understand
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
So I multiply now
ya so now cross multiply
set those equal to each other and cross multiply
I am lost
you've got your ratios set up?
ok so now cross multiply:
then finish solving for x
Divide by 4.5
ok give me a sec
I got 8ft tall
well there you go!
Thanks so much
You're welcome :)
You are good
You like math
no i really dont
I do Haha
hey you know anything bout radiation in Japan?
Can you help me with 1 more?
Just from the news
its for my hw i need to know about the rafdiation stuff
A map uses a scale of 1 centimeter for each 5 kilometer
I can tell you what I have seen
If the distance on a map from City A to city B is 17.5 cm
what is the distance between the cities in kilometers
and in miles
well i dont know about miles
but i can help you with the other thing
There are 2.54 cm in 1 inch and 5280 ft in 1 mile
so you know that for eveery centimeter it is equal to 5 kilometers
What do you need to know about the radiation?
w8 lemme help you with your stuff then you tell me radiation blah blah
Use ratios again.... cm/km = cm/km or 1/5 = 17.5 cm/x
then cross multiply
yup exactly what he/she said
oh ok lol
would 1/5 be over 1
no, just leave it as 1/5
How can it be cross multiplied?
1 * x = 5 * 17.5
I meant 87.5
Yes, 87.5 km
lol 64 replies!!!!!!!!!!
to this question
Now to convert 87.5 km to miles?
Convert km to cm, then cm to inches, inches to feet, and feet to miles
I am not good with geometry
there are 1000 meters in one km, so first multiply by 1000
Will that -= the miles
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
so it's 8,750,000 cm
we would g through all the steps to get to the miles, correct?
yes, from cm, you would convert to get inches, then with inches you can get feet, and then feet to miles
You have to be careful though. There are 2.54 cm in 1 inch, so this time you DIVIDE by 2.54
36 inches in 1 ft, so DIVIDE by 36
You would divide 8,750,000 by 36?
no, divide by 2.54 first
then that answer by 36
then last step, 5280 ft in a mile
yes, but don't round the answer until you have divided by 5280
and round answer to however many decimal places you need
I got 18.12 miles
Hmmmm, that doesn't sound right....let me double check my work :)
NO, that IS right...I was thinking about something else...Sorry :)
Haha, I'm confusing myself....let me check that
I messed you up....so, sorry....there are 12 inches in a foot....OOPS
we used 36.....sorry about that
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.
ok, how far do I go back?
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
I am trying to scroll up
we're gonna make the world record for most replies on open study
87.5 * 1000 * 100 ....then take that answer and divide by 2.54, then divide by 12, then divide by 5280
Ok, doing that now, did you see my response abt the radiation?
I got 54.37 miles
Yes, that is correct....AND that answer makes sense LOL Sorry about the other. It's right now :)
oh i didnt notice that thank you!
You're welcome...I'll let y'all chat about Japan now :)
A lot of people has been diagnosed with radiation, and some are bad
Thanks so much
hey you know where you got that info like what was the news channel?
It was my local news.
I bet you can get more information on-line
maybe type in radiation in Japan
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
I know it is ABCnews.com
I am checking to make sure it is correct
I am here seeing if I can post the link
wait i got it
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/
no waIT no
Wait that one is not local
that was nt about it being in the U.S. was it?
um no it's about radiation in thje food and water
Darn, my page all scrambled, i am tying to clear it
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
Is that ok
Thanks for your help today and it was nice to meet you
could you fan me?
I do not know how to
it says become a fan next to my name
Where, I do not see it
Where it says NY,NY it says star (11 fans next to that it says become a fan
It does not say that on my screen
I see everything except become a fan
but it should there is a thumbs up picture and nexto it it says Become a fan
The thumbs up is not there
Are you still here
Thats ok, if I attache a file can you see it
It has my homework on it and it is geometry, I am about to fail it and ned help
um w8 im sorry im doing homework
I am about to get back to my work as well. thanks for all your help
your very welcome
will you stay online ?
ltkrlkmh;kjdhjej kheeetj kjer;k;byet
Did you consider inches vs feet for the original building? An 8 ft high building sounds kind of short!
uh radar, you do understand this question is from 6 DAYS AGO?????????
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?
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!
but if it is feet to inches then isnt it 3 ft: 4.5 in? where does 36 come from?
3 ft is 3 *12 = 36 in.
The 3 ft yardstick cast a shadow of 4.5 inches.
Radar, you are correct. I completely overlooked that when I was working that problem.
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.