Provide an appropriate response.
Determine which ordered pair is NOT a solution for the equation:2x - 5y = 20
A. (10, 0)
B. (0, 4)
C. (-5, -6)
D. (5, -2)
Answer: B
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Solve the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form.x+ 2y+ 2z= -21 2y+ 3z= -23? z= -5
A. No solution B. (-3, -4, -5) C. (-5, -4, -3) D. (-3, -5, -4)
Multiply.-9(x + 8)
A. 9x - 72 B. -9x + 8 C. -9x - 72 D. x - 72
Solve.One method to determine the time since an animal died is to estimate the percentage of 
remaining in its bones. The percent P in decimal form of 
remaining x years is given by 
Approximate (to the nearest whole year) the age of a fossil if there is 65% of 
remaining.
A. 1546 B. -15,469 C. 3560 D. -34,499
Fill in the blanks:
(a) Given sets A and B, to prove that (A ? B) ? (A ? B) ? A, we suppose that x ? __________ and we must show that x ? __________. (b) By definition of union, to say that x ? (A ? B) ? (A ? B) means that __________.