Solve the problem.A sample of 400 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 20 years? Round your answer to the nearest whole gram.
A. 1 g
B. 0 g
C. 33 g
D. 243 g
Answer: D
Mathematics
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Write the percent as a decimal.70%
A. 0.7 B. 0.07 C. 0.59 D. 7
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Solve the given equation by finding the unknown value.6 ? ? = 828
A. 138 B. 822 C. 4968 D. 6
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Solve the problem.Evaluate the expression: 
A. 3 B. 10 C. 8 D. 5
Mathematics
Solve for the indicated variable.
+ 
= c, for a
A. a = 
B. a = 
C. a = bc - 
D. a = 
- b
Mathematics