Answer:
1.6* 10^5
Step-by-step explanation:
1. Move the decimal place to the left to make a number from 1 to 10.
2. Find the exponent, that is the number of times you moved the decimal.
3.Then put the number in scientific notation.
The scientific notation:
where
and
We have 16000:
B. 840
21 is 70% of 30 and 70% of 1,200 is 840.
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