exam Maths Puzzle Numerical Ability

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)?

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exam Other Question

The amount of a radioactive tracer remaining after t days is given
by A = A0 e-0.058t, where A0 is the starting amount at the beginning of
the time period. How many days will it take for one half of the
original amount to decay?
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