Find the solution to the system of equations by substitution.
A. (5, 3)
B. (3, 5)
C. (-5, 3)
D. (-19, 3)
Answer: A
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Find the indicated probability.The following table show the results of a clinical trial for an allergy drug. 
What is the probability that a randomly selected person was given a placebo and improved? Round your answer to the nearest thousandth when necessary.
A. 0.69 B. 0.17 C. 0.942 D. 0.772
Divide, if possible. If not possible, write "not defined."
A. 33 R5 B. 200 C. 1 D. Not defined
Consider only the discriminant, b2 - 4ac, to determine whether one real-number solution, two different real-number solutions, or two different imaginary-number solutions exist.x2 + 8x + 5 = 0
A. Two different imaginary-number solutions B. Two different real-number solutions C. One real solution
Use a graphing calculator to sketch the graph of the quadratic equation, and then give the coordinates for the x-intercepts (if they exist).y = -x2 + 14x - 45
A. (-5, 0); (9, 0) B. (5, 0); (9, 0) C. (-5, 0); (-9, 0) D. (5, 0); (-9, 0)