Thomas earns $2100 per month and then got a 15 raise .how much will thomas make per month after his raise

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|

Astudent is solving a system of equations by substitution and comes up with the solution 3 = 3. assuming that he solved the problem correctly, which of the following can be said about this system of equations?

Can you me with perpendicular lines and parallel lines?