A class design requires that a particular instance variable must be accessible by any subclasses of this class, but otherwise not by classes which are not members of the same package. What should be done to achieve this

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron (not a pyramid). the pyraminx shown below has edges 15\,\text{cm}15cm15, space, c, m long and vertical height h=12.2\,\text{cm}h=12.2cmh, equals, 12, point, 2, space, c, m. the triangle drawn with dashed lines is a right triangle. what is the distance rrr? round your answer to the nearest tenth.

What is the algorithm for building a binary tree program

Which cultural aspect does this type of song best portray? a german polka dance