Find volume of a regular hexagonal prism edge length 10and height 10

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.