Answer: 1. 28 2. 25
Hope this helps!
Didn't know if you wanted the explanation or not, so sorry. But I can put an explanation if you need it.
Answer:
its number 3
Step-by-step explanation:
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for number 19, figure out the exponents then multiply.
for scientific notaintion you figure out how many numbers are behind the decimal , then do that number as an exponient to 10 then multiply by that number. i hope i made a bit of sense. if not look at kahn academy for help !