Guys my parents took away my best friend and I am depressed.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Write 5 in the form of a/b using integers to show it as a rational number

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.