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Andreas93 [3]
3 years ago
15

-6x+10y=-24 -12x+y=9 by elimination​

Mathematics
1 answer:
n200080 [17]3 years ago
8 0

Answer:

K

Step-by-step explanation:

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Twenty-five decreased by one fifth of a number is 18. Find the number.
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You have to work backwards, you find what 25-18 is (7)

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How much of a radioactive substance must be presented to decay to 40 grams in 9 years if the half-life of the substance is 4.6 y
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c.

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