exam Maths Puzzle Numerical Ability

If 100 grams of a radioactive material diminish to 80 grams in 2 years, find the half life of the substance

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exam Other Question

I need to see how to solve the following problem:
-3(8 - c)= 7c Choose the one alternative that best completes the statement or answers the question. Approximate the number using a calculator. Round your answer to three decimal places.
3^-3.4
a. 0.324
b. 0.024
c. -10.200
d. -39.304