Whats the value of x

Paint color preference children adults total 0.6 0.77 liked new paint color disliked new paint color 0.4 0.15 0.23 total 1.0 1.0 1.0 which value for x completes the conditional relative frequency table by column?

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

Write the pair of fractions as a pair of fractions with a common denominator