Perform the indicated operations. Round to the nearest tenth.
A. 9.0
B. 0.1
C. 12.1
D. 12.4
Answer: D
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Verify the identity.
= cot 
What will be an ideal response?
Evaluate using substitution. Do not use Table 1 or CAS.
Tell whether the statement 
is true or false.
?
A. false B. true
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