The answer is 2 : 8-2+3 = 6+3=9. 10 - 3 + __ = 9. 7 + __ = 9. ---> 9-7 = 2.
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Equals C equals is not a correct bond. In order to create a bond, you will need to have an elemental symbon on either side of the equal sign. C equals C would be a correct bond type.
Expressed with the equals sign at the end, this sum would be written: 8 - (3 + 2.8) = 2.2
Neither of the two is correct. It would be 12 inches equals a foot or 144 inches equals 12 feet.
The correct value for A multiplied by 0.1 would be 1.
You would have to know the rule for calculating a number from the word.