Hello there!
To find the scientific notation, we must turn it into decimal first.
To find the decimal, take the numerator and divide it by the denominator.
13/250 = 0.052
The scientific notation of that is:
52 * 10^-3 (This is the answer)
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We can check our work if we want to!
52 * 10^-3
= 52 * 1/10 * 10 * 10
= 52/(10 * 10 * 10)
= 52/10^3
= 52/1000
= 13/250
See, we got the same number as the one they give.
Let me know if you have any questions about the answer. As always, it is my pleasure to help students like you!