If f(x)=2x+5, then f(4) represents what

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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.

Graph the function =gx+2x3 and give its domain and range using interval notation.