Answer:
2630
Step-by-step explanation:
2630x
-6
Additive inverse is the number that when added to A gives a result of zero
A + inverse = 0
6 + inverse = 0
inverse = -6
15.07964
..................
11 = -d+15
subtract 15 from each side
-4 = -d
divide both sides by -1
d = 4
and inner radius 
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