Perform the operation. Write the answer as a fraction in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Answer: D
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Simplify, where possible.2a - 2b + 6c - 2(5a + 6b - 9c)
A. -3a + 4b - 3c B. -8a + 10b - 12c C. -8a - 8b + 15c D. -8a - 14b + 24c
Find the probability of the event if a single choice is made from a bag.A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. What is the probability of choosing a marble that is not blue when one marble is drawn from the bag?
A. 
B. 
C. 8
D. 
Find the absolute value of the complex number.z = -23
A. 0 B. 23 C. -23 D. 46
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 10 years? Round your answer to the nearest whole gram.
A. 12 g B. 1 g C. 282 g D. 0 g