Please help!! I would really be happy if anyone could help

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d