What is the theoretical probability of not rolling a 2?

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

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