The center of a circle is at (1, 3). If the circle passes through the point (4,7). what is the length of the radius of the circle?

Answer this question, only if you know the answer. 30 points and brainliest!

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?