exam Maths Puzzle Numerical Ability

Two die cast car models were purchased at the same time. The first cost $99.50 and appreciated by 10% yearly. The second cost $49.50 and appreciated 16% yearly. Algebraically deter

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Okay im not exactly sure what to do here.
The half-life of radon-222 is about 85 hours. What fraction of an intial amount of the material would be left afer 10 hours?

Thanks for the help! How far away from th e pole at ground level will the guy wire need to be to main tain the thirty degree angle with the pole. The heigth of the pole is 50ft.