51, because 39+12=51. You just add both parts of the tree. Please Rate Brainliest.
Answer:
Step-by-step explanation:
An arithmetic sequence that is described by the explicit formula ...
can also be described by the recursive formula ...
Matching parts of the formulas, we see that a1 = 4, d = -7. Putting these values into the explicit formula gives ...
Radius equals: 4.51
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Answer:
D. 0.682
Step-by-step explanation:
Answer:
its c......................................................
Step-by-step explanation: