-0.5 is the same as -1/2, or any other expression that equals this.
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When you have decimals you times them buy 100 to get the percent so .5 equals 50% and .05 equals 5% and .005 equals .5%
If AC equals 6 and BD equals 4, then AB equals 5.
When equals are added to equals, you don't necessarily get wholes. But whatever you do get, they're equal.
9
The answer is 20.