+0  
 
+2
585
4
avatar+225 

How high is a tree that casts a 35 -ft  shadow at the same time a 9 -ft  post

casts a shadow which is 7 -ft

long?

 

The tree's height is ___ ft.

 

 

I have 57.5 is it came out wrong what should I calculate to get the right answer?

 Nov 29, 2017

Best Answer 

 #2
avatar+96368 
+3

Let H be the tree height....so we have

 

H / 35  =  9 / 7      multiply both sides by 35

 

H  =  (35 * 9)  / 7   =  (35/7) * 9  =  5 * 9  =  45 ft

 

 

cool cool cool

 Nov 29, 2017
 #1
avatar
0

7/ 9 x 35 =27 2/9 Ft - the height of the tree.

 Nov 29, 2017
edited by Guest  Nov 29, 2017
 #2
avatar+96368 
+3
Best Answer

Let H be the tree height....so we have

 

H / 35  =  9 / 7      multiply both sides by 35

 

H  =  (35 * 9)  / 7   =  (35/7) * 9  =  5 * 9  =  45 ft

 

 

cool cool cool

CPhill Nov 29, 2017
 #3
avatar
+1

sorry, got it backwards !!

 Nov 29, 2017
edited by Guest  Nov 29, 2017
 #4
avatar+7348 
+2

A 9 ft post casts a 7 ft shadow.

A 45 ft tree casts a 35 ft shadow.   smiley

hectictar  Nov 29, 2017

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