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Please answer my question, I asked the same question before and didn't get the answer I wanted. Why does the semicircle go from x=-4 to x=10? Why is the shaded part 1/4 of a circle? Thank you!

Use the formula for the area of a circle to calculate $?_{?4}49?(x?3)_{2}?dx$. If applicable, enter your answer in terms of $?$. Answer 1: Not quite right - check out the answer explanation. $249??$ Answer 2: