Solve the equation.|x + 1| = 7
A. {-8, 6}
B. {-6}
C. {8, 6}
D. no solution
Answer: A
Mathematics
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Mathematics
Solve the problem.A sample of 800 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 to the nearest whole gram.
A. 800 grams B. 1 gram C. 605 grams D. 9 grams
Mathematics
Solve the inequality. Express your answer using interval notation. Graph the solution set.x - 3 < 4
A. (7, ?)
B. (-?, 1)
C. (-?, 1]
D. (-?, 7)
Mathematics
A student borrowed $640 for 15 months at 9%. How much interest was paid?
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Mathematics