If i had 2 cats and my mom bought me 4 dogs how many animals is that in total​

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

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.