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This is the formula for circumference of circle
Answer:
Option A. 
Step-by-step explanation:
we know that
A perfect square trinomial is equal to

In this problem we have

equate the equations and solve for a

so


therefore
the perfect square trinomial is equal to 
Answer:
7y-15+2y= 9y-15
9y-15
.....
Step-by-step explanation: