exam Maths Puzzle Numerical Ability

Can someone help with this problem.

Simplify:

(-2c^5)^4*c^7/c^13

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exam Other Question

a)Mary invested $600 at the Royal Bank at an interest rate of 3.6% per year.How much money will she have after 12 years?
b)The half-life of radium is 1400 years. If there was 800 grams of radium, how much will remain after 5000 years? I have been struggling on this problem for a while now and I was wondering if anyone could help me? I would deeply appreciate it!! Please and Thank You!!

Absolute Values of Pr