Solve the problem.The following data pertain to the residual chlorine in a swimming pool at various times after it has been treated with chemicals. 
Find the regression line y = mx + b.
A. y = 0.025x + 4
B. y = -0.37x + 8
C. y = -0.11x + 2
D. y = 0.22x + 3
Answer: C
Mathematics
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Find the probability.A bag contains 5 red marbles, 3 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. 6
D. 
Mathematics
Add or subtract as indicated. Express the answer as a single polynomial in standard form.(9x2 + 5x + 2) + (2x2 - 3x + 8)
A. 11x2 - 2x + 10 B. 4x2 + 6x + 13 C. 11x2 + 2x + 10 D. 11x2 + 2x - 10
Mathematics
Find the modulus of the complex number.8
A. 2.83 B. 64 C. 8 D. 4
Mathematics
Find the slope of the tangent line to the graph at the given point.f(x) = 2x - 10 at (8, 6)
A. -10
B. 10
C. 
D. 2
Mathematics