In parallelogram ABCD, what is DC?

A recent schools question and answer requested students to state what they think is the main important element for a student to do in order to achieve success. The one that response stood out from the rest was practice. People who generally are successful do not become successful by being born. They work hard and dedication their lives to succeeding. This is how you can achieve your goals. down below are one of the answer and question example that you could simply work with to practice and boost your practical knowledge and also give you insights that could help you to sustain your study in school.

Question:

In parallelogram ABCD, what is DC?

Answer:

This is a parallelogram which means the two opposites sides are equal. Then, we can solve the problem as shown below:
mAB = m DC
9x -14 = 3x + 4
Transpose and combine same term:
9x – 3x =4 +14
6x= 18
x=3

Solving for DC:
DC = 3X + 4 
DC = 3(3) + 4
DC = 13 units.

The answer is 13.

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