What is the value of x when the richter scale rating is 5.9 round your answer to the nearest hundredth

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

What is 140% of 25? because i need

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.