exam Maths Puzzle Numerical Ability

can you please help me solve this: [(-1/2)c^2b^3a](2a^2b^2c^4)

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exam Other Question

421 exceeds nine times a number by 61. What is the number?

I am confuse meaning of exceeds please help me

thanks

sree How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t)=450e^.216t, where t is the time in years? Round your answer to the nearest hundredth year.