Write a system of linear equations in three variables, and then use matrices to solve the system.There were approximately 100,000 vehicles sold at a particular dealership last year. The dealer tracks sales by age group for marketing purposes. The percentage of 36- to 59-year-old buyers and the percentage of buyers 60 and older combined exceeds the percentage of buyers 35 and younger by 38%. If the percentage of buyers in the oldest group is doubled, it is 24% less than the percentage of users in the middle group. Find the percentage of buyers in each of the three age groups.
A. 33% 35 and younger; 51% 36-59 year olds; 16% 60 and older
B. 25% 35 and younger; 56% 36-59 year olds; 19% 60 and older
C. 15% 35 and younger; 54% 36-59 year olds; 31% 60 and older
D. 31% 35 and younger; 54% 36-59 year olds; 15% 60 and older
Answer: D
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A. 
B. 
C. 
D. 
Without graphing the function, state the shift(s) that are applied to the graph of 
to graph the given function. If the graph of 
must be rotated about the x-axis, state this.f(x) = -(x - 2)2 + 7
A. right 2 units, up 7 units B. rotate about x-axis, left 2 units, up 7 units C. rotate about x-axis, right 2 units, up 7 units D. right 7 units, down 2 units
Write the first n terms of the given arithmetic sequence (the value of n is indicated in the question).a3 = 6, d = -4, n = 5
A. 18, 14, 10, 6, 2 B. 14, 10, 6, 2, -2 C. 14, 10, 5, 2, -2 D. 10, 6, 2, -2, -6
Solve and graph. Write the result in interval notation.a - 4 < 6 
A. [10, ?)
B. (-?, 10]
C. (-?, 10)
D. (10, ?)