True of false: there is always one solution of a system of linear equations

Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

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

Ineed with number 6 , explain how to get 1978