12 is the answer hope it help
Answer:

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Answer:
I believe the answer to this question is: Slope-Intercept-Form;
Y= - 7/2x - 27/2.
The weight of a plane with 81 gallons of fuel in the tank is about 44 tons
Numbers can be expressed, ordered and compared by a lot of
mathematical principles, properties, models and paradigms. There are different
properties of numbers to associate, group and distribute numbers. For example
commutative property of addition, 1 + 2 = 3 can be 3 = 1 + 2. Moreover, numbers
can be expressed by mathematical form, thus 100 wherein 1 is in the place order
of hundreds. And so on… other examples can be mathematical symbols or
inequality to compare numbers. For example, 1 > 2. One is less than 2.