Answer:
6/8
Step-by-step explanation:
-15
(5)(−2)−(21−(3−11)(−2))
=−15
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concentration = 8/84 + 8 = 0.8696
3.9
x/15 = 23.4/90
15 X 23.4= 351
351/90=3.9
3.50 + 2.50x =21.00
2.50x = 17.5
x = 7
<u>9+7</u>
3+1
=4