What information can the positive and negative numbers on a number line provide?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Name the element in group 17, period 2. (periodic table)

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?