exam Maths Puzzle Numerical Ability

How do you work these problems? I have no Idea where to start! Help!

Solve and graph the solution:

-12 is greater than or equal to 24x

Read Solution (Total 0)

exam Other Question

IF POINTS A,B, AND C LIE ON A C0ORDINATE LINE AND POINTS A AND B HAVE COORDINATES 15 AND 7 RESPECTIVELY, THEN WHICH OF THE POSSIBLE COORDINATE FOR POINT C SATISFY d(A,C)<d(B,C)? Can you please help me simplify:
-4x^-3/8(5x^1/8-x^2)
I would really appreciate your help.