exam Maths Puzzle Numerical Ability

This is a homework assignment not in the book. Ra226 has a half-life of1600 years. How many grams of Ra226 will be present after 2000 years if there are 20g present initially?

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exam Other Question
find the derivative of 2(pi)(r)-(2v/r^2) I know this might not be the right type of problem but i guessed.

how many solutions does the system have? 2x-3y = 11
6x-9y = 33


a. 0
b. 1
c. 2
d. infinite