Solve.The radioactive decay of radium 226 can be described by the equation 
where C is the original amount of radium and A is the amount of radium remaining after t years. If 27 milligrams of radium are sealed in a container now, how much radium will be in the container after 100 years. Round to the nearest thousandth.
A. 25.869 mg
B. 26.988 mg
C. 1.202 mg
D. 28.18 mg
Answer: A
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Add.544 + 2,265
A. 2,819 B. 2,809 C. 2,709 D. 1,809
What property of addition is used in the equality?(9 + 9) + 1 = 9 + (9 + 1)
A. Closure property B. Commutative property C. Additive-identity property D. Associative property
Write the whole number in word form.7,040,739
A. seven million, forty thousand, seven hundred thirty-nine B. seven million, four thousand, seven hundred thirty-nine C. seven million, four hundred thousand, seven hundred thirty-nine D. seventy-four hundred thousand, seven hundred thirty-nine
Prepare a probability distribution for the experiment. Let x represent the random variable, and let P represent the probability.Two marbles are drawn from a bag in which there are 4 red marble and 2 blue marble. The number of blue marbles is counted.
A. 
B. 
C. 
D. 