Consider determining how many possible phone numbers are in an area code (repeated numbers allowed). Isthis a combination, a permutation, or neither

What is the measure of angle x? a.101 b.158 c.44 d.79

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.

The diagram shows a cuboid abcdefgh abcd is a square with area 25cm². find the volume of the cuboid.