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Arturiano [62]
4 years ago
9

How do I solve this

Mathematics
2 answers:
bonufazy [111]4 years ago
8 0
If ABC is ~ to DEF then
AB is ~ to DE
35~x and
BC is ~ to EF
30~15
30/2= 15 So 35/2= 17.5
svet-max [94.6K]4 years ago
5 0
Both triangles are similar because of angle angle similarity.

So you can just make a proportion.

\frac{CB}{BA} = \frac{FE}{x}

Insert the numbers:
\frac{30}{35} =  \frac{15}{x}

Cross multiply: 30x = 520
x = 17.5
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Andrea wanted to calculate 5% of 300, so she multiplied 300 by 0.5 (300 x 0.5).
Mars2501 [29]
This is because Andrea converted the Percentage wrong.
to Convert a Percent to a Decimal, she should have divided by 100
so  5 divided by 100 = 0.05  [not 0.5]
Andrea should have multiplied 300 by 0.05 instead to get the right answer

quickly finding 10% of a number means to simply move the decimal to the left one place
so  10% of 300 is 30

since  5% is half of 10%
half of 30 is 15

and so  5% of 300 is 15
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