A 4 foot pole casts a shadow of 3 feet. How tall is a tree with the shadow of 12 feet?
I came up with the tree being 11foots? Thats what make sense to me? Does anyone else have something diffrent?
2006-10-20 01:32:29 · 10 answers · asked by olivia b 1 in Education & Reference ➔ Homework Help
No, I got the same. It's just minus 1 I think. Should have the formula in your text book.
2006-10-20 02:12:05 · answer #1 · answered by Anonymous · 0⤊ 0⤋
no, the answer is not correct. I believe the answer woujld be 16 as for ever 4 feet in height there is a 3 ft shadow. I got my answer by dividing 3 into the 12 ft which makes 4. then multiplying the 4 by 4 which makes 16. (3ft shadow into length of shadow which makes 4, then 4 ft which is what we know the pole is times the ans of 12 divided by 4 which equals 16
2006-10-20 01:46:40 · answer #2 · answered by bettyswestbrook 4 · 0⤊ 0⤋
11 is, i'm sorry to say, incorrect. this is not a difference between the object and the shadow, but the scale factor of one object and another.
if the shadow of the pole is 3 and the shadow of the tree is 12...to get the scale factor of the height of the pole to the height of the tree you just divide 12 by 3, which gives you 4. then you multiply 4 by the height of the pole (cuz judging on the shadow is 4 times bigger than the pole's shadow, the tree must be 4 times bigger than the pole)...so that gives you 4x4 which then gives you 16.
never ever take the difference and add it on or subtract it in these type of questions...cuz that will just make the case a coincidence.
2006-10-20 01:44:05 · answer #3 · answered by ChristopheraX 4 · 0⤊ 0⤋
They are trying to get you to use a ratio. If a 4 ft. pole casts a shadow of 3 ft. then that is the ratio 4:3. You need the ratio to be equal. You do that by multiplying/dividing the same number to both sides of your ratio.
So you question would look like this:
4:3 = 12:_______
To get the answer you would figure out how many times 4 goes into 12 and multiply that number to 3.
I don't want to give you the answer, but I hope this helps.
BTW- the answer isn't 11.
2006-10-20 01:39:32 · answer #4 · answered by Grrl 3 · 0⤊ 0⤋
The relation ship should stay the same, if the pole and the tree are straight.
Like this 4 is to 3 as x is to 12 you know how to do that?
4---3
x---12
4 times 12 divide by 3 will give x (4*12)/3 = 16
2006-10-20 04:53:01 · answer #5 · answered by Roy 3 · 0⤊ 0⤋
16 feet.
The shadow cast is 3 quarters length of the object in your example with the pole of four feet.
With the tree shadow of 12, 12 is 3 quarters of 16. (4 feet being one quarter.)
2006-10-20 01:35:29 · answer #6 · answered by Nix 3 · 0⤊ 0⤋
You need to calculate the angle of the sun by taking the rise of the pole over the run of the shadow and do inv. TAN
4/3 2nd TAN
that gives you the sun at a 53 degree angle to the ground.
then use the tan of 53 to the trees given value of 12
tan of 53 = X/12
tree is 15.9 ft tall.
2006-10-20 02:20:50 · answer #7 · answered by sportyscott_28 3 · 0⤊ 0⤋
6 feet but the sun has to be just right and the wind out of the south !
2006-10-20 01:34:46 · answer #8 · answered by smitty 3 · 0⤊ 0⤋
you recognize that each thing jointly cost 510 permit the mathematics e book equivalent to b and permit the technology e book equivalent to B 510=80b+70B then you definitely know you have a entire of 7 books so which you're making this equation: 7 = b + B then sparkling up it for b which provides 7 - B = b plug it into your first equation and you get 510=eighty(7-B) + 80B sparkling up for B 510=560 -80B + 70B B = 5 then 7 = b +5 b = 2
2016-11-24 19:35:14 · answer #9 · answered by maza 4 · 0⤊ 0⤋
16 feet...havn't u heard of proportion yet????ur maths is sick ...
2006-10-20 01:41:11 · answer #10 · answered by Demo 3 · 0⤊ 0⤋