What is the value of x?

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Does the point (1, sqrt 7) lie on circle shown.

Solve this problem! extra ! 3025/5.5 = a/90.75

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same