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Soloha48 [4]
3 years ago
11

Help quickly as possible thank you :) ​

Mathematics
2 answers:
STALIN [3.7K]3 years ago
5 0

Answer:

look at the picture, answer is there

Bas_tet [7]3 years ago
5 0

9514 1404 393

Answer:

  about 100 years

Step-by-step explanation:

2020 -1920 = 100

Outdoor lights were made safe about 100 years ago. (using information given in the problem statement)

_____

<em>Additional comment</em>

2020 -1930 = 90. So, the actual length of time is <em>between 90 and 100 years</em>.

Using additional research, we find mercury vapor lights were made to have a practical color in about 1929, so 91 years ago. They were invented somewhat before the 1920's but had a greenish color. Fluorescent phosphor coating was added in 1929 to make them produce a whiter light.

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