Solve the problem.Suppose that during a certain step in a chemical manufacturing process the amount of hydrogen sulfide dissolved in a solution, measured in parts per million (ppm), is related to the elapsed time measured from the beginning of the step. Use the following table as a representation of this relationship. What does the ordered pair (9, 24.4) mean in the context of this situation?
A. (9, 24.4) indicates that 24.4 ppm of hydrogen sulfide was dissolved after 9 minutes elapsed.
B. (9, 24.4) indicates that 24.4 ppm of hydrogen sulfide was dissolved after 9 seconds elapsed.
C. (9, 24.4) indicates that 24.4 ppm of hydrogen sulfide was dissolved after 15 minutes elapsed.
D. (9, 24.4) indicates that 9 ppm of hydrogen sulfide was dissolved after 24.4 minutes elapsed.
Answer: A
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Find an equation for the sphere with the given center and radius.Center (-3, 8, 0), radius = 4
A. x2 + y2 + z2 + 6x - 16y = -57 B. x2 + y2 + z2 + 6x + 16y = -57 C. x2 + y2 + z2 - 6x - 16y = -57 D. x2 + y2 + z2 - 6x + 16y = -57
Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 20 watches B. 31 watches C. 63 watches D. 39 watches
Solve the inequality and graph. Express your answer in interval notation.-29 ? -4x - 1 ? -13
A. (-7, -3)
B. [3, 7]
C. [-7, -3]
D. (3, 7)
Solve the equation by completing the square.6x2 + 2x - 4 = 0
A. 
, -1
B. 
, -1
C. 
, 1
D. 
, 1