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 !
Answer:
-2y + 6 = -12
Step-by-step explanation:
well the answer is 9, y=9 :)
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The answer is 21, because if you multiply 21 times 3 you get 63