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Mathematics 11 Online
OpenStudy (anonymous):

NEED HELP WILL MEDAL!!! Charles places a mirror on the ground 63 feet from the base of a tree. He walks backwards until he can see the top of the tree in the middle of the mirror. At that point, Jason's eyes are 6 feet above the ground and he is 9 feet from the image in the mirror. What is the height of the tree? A. 69 feet B. 94 feet C. 42 feet D. 54 feet

OpenStudy (anonymous):

i think its D.

OpenStudy (welshfella):

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OpenStudy (anonymous):

so D?

OpenStudy (welshfella):

the big triangle and little triangle are similar so the corresponding sides are in the same ratio. let height of the tree be x ::- x / 6 = 63 / 9

OpenStudy (anonymous):

?

OpenStudy (welshfella):

solve for x

OpenStudy (anonymous):

54?

OpenStudy (welshfella):

do you follow that ok?

OpenStudy (welshfella):

right side = 63/9 = 7#so we have x / 6 = 7 what is x?

OpenStudy (welshfella):

54 is incorrect

OpenStudy (anonymous):

oh 42....

OpenStudy (welshfella):

what number when divided by 6 gives 7?

OpenStudy (anonymous):

42

OpenStudy (welshfella):

right height of the tree is 42

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