Which conic section is defined by the set of all points in a plane for which the sum of the distances to two fixed points equals a certain constant? A.
Parabola

B.
Hyperbola

C.
Ellipse

D.
Circle

Which of the following tables represents exponential functions?

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.

A. 15 degrees b. 45 degrees c. 30 degrees d. 60 degrees