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harkovskaia [24]

2 years ago

6

Shayla is 5 feet tall and casts a shadow 2 feet long. at the same time, a nearby lamppost casts a shadow 8 feet long. write and

solve a proportion to find the height of the lamppost.

2 answers:

viktelen [127]2 years ago

7 0

Using cross-multiplication:

shadow/height

2/5 = 8/x

8x5=2x
40=2x
20=x
The lamppost is 20 feet tall.

777dan777 [17]2 years ago

6 0

Here is a proportion

5/2 = x/8

2x = 40
/2 /2

x = 20

Hope this helps

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B . cos (arsin (x/8))

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D . sin ( arctan (x/8))

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To solve this we have to find the missing sides to each of the triange discribed in prenthesis thus

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B

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B . cos (arsin (x/8)) ....sqrt(64-x^2)/8

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