2 answers:
Answer:
x = 3 ×10^2
Step-by-step explanation:
To determine how many times larger the culture sample was compared to a week earlier
We divide the values of the present sample to the past sample size
3.9 x 10^5/ 1.3 ×10^2
3.9/1.3 x10^5-3 = 3 ×10^2
Answer-
the first box is 3 the second is 10 to the third then the last = 3,000
Step-by-step explanation:
just did it
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