Best Answer

To find this:

You know (B+C) = 7. Therefore you know (A+A )= 21 - (B+C). Therefore 21-7 = 14.

So now you know (A+A) = 14. So you divide (A+A)/2.

This equals 7. Therefore A = 7.

Q: What is the value of a if ab plus ac equals 21 and b plus c equals 7?

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It is an expression and a term that are of equal value

Commutativity.

The existence of the additive inverse (of ab).

That depends on the value of CD and the perimeter of the quadrilateral out lined in the question

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Related questions

BS

yes because ab plus bc is ac

It is an expression and a term that are of equal value

2ab

x = ab x = 21*37 x = 777

Commutativity.

The existence of the additive inverse (of ab).

No. A times B = AB

That depends on the value of CD and the perimeter of the quadrilateral out lined in the question

associative property

the midpoint of AB.

C minus B equals AB