Use the substitution method to solve the system.
= 5 6x = 10 + 12y
A. 
B. No solution
C. 
D. Infinitely many solutions
Answer: A
Mathematics
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Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 4 years. If necessary, round to three decimal places.
A. 2140.644 B. 214.064 C. 0.000 D. 0.001
Mathematics
Perform the indicated operation and simplify if possible.(2x3 + 2x2 - 9x + 1) - (8x3 - 6x2 + 4x - 8)
A. -6x3 + 8x2 - 13x + 9 B. -6x3 - 4x2 - 5x - 7 C. 10x3 - 4x2 - 5x + 9 D. 10x3 - 4x2 - 5x - 7
Mathematics
Multiply.0.69 × (-1000)
A. -0.69 B. -6900 C. -690 D. -69
Mathematics
Find the value of the determinant.
A. -6 B. 6 C. 0 D. -12
Mathematics