Answer:
D) 10 units
Step-by-step explanation:
Opposite sides of a parallelogram are congruent.
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setup
The relation between opposite sides tells you ...
BC = AD
2x = x +5
solution
x = 5 . . . . . . . subtract x from both sides of the equation
We want the length of AD, which is ...
AD = x +5 = 5 +5
AD = 10
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Additional comment
Often, it seems like the question is answered once the value of x is found. Here, finding the value of x is an intermediate step. The value of x is needed in order to be able to answer the question about the value of an expression involving x.
