Find an equation of the set of all points equidistant from the points A(7,-8,-9) and B(-6,4,-12)
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b. 13x-12y+3z=-1
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Find the difference.7 - 9
A. 16 B. 2 C. -16 D. -2
Solve the problem.The graph shows the increase in dental contacts per person from 1990 to 1998.Dental Contacts Per Person
YearAssume that the rate of increase continues for the next several years. Using the average yearly increase from 1990 to 1996 to find a linear model, predict the number of dental contacts per person in 2008.
A. 7.10 B. 2.83 C. 5.10 D. 5.60
Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
(i) Graph f in [0, 85, 5] by 
(ii) Use the intersection-of-graphs method to estimate the x-values where 75% to 90% of the pollutants are removed.
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A. 
75% to 90% are removed when
about 46 to 55 liters of air are
filtered.
B. 
75% to 90% are removed when
about 38 to 46 liters of air are
filtered.
C. 
75% to 90% are removed when
about 25 to 31 liters of air are
filtered.
D. 
75% to 90% are removed when
about 31 to 38 liters of air are
filtered.
Solve the problem.The final grade for an algebra course is determined by grades on the midterm and final exam. The grades for four students and two possible grading systems are modeled by the following matrices. src="https://sciemce.com/media/4/ppg__tttt0519191117__f1q44g6.jpg" style="vertical-align: -15.0px;" />Find the final course score for Student 3 for both grading System 1 and System 2.
A. System 1: 77.2; System 2: 76
B. System 1: 87.3; System 2: 85.5
C. System 1: 69.3; System 2: 101.7
D. System 1: 44.2; System 2: 53
