Evaluate.For the piecewise function f(x) = 
, find (f ? f)(-6).
A. -3
B. 15
C. 3
D. 9
Answer: B
Mathematics
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Solve the problem.Rule: The sum of any two horizontally adjacent numbers is the number immediately below them. Use this rule to complete the array. 
A. 
B. 
C. 
D. 
Mathematics
Solve.In the land of Taxalot, the function T(x) = 0.21(x - 8400) + 770 represents the tax bill T of a single person whose adjusted gross income is x dollars for incomes between 8400 and 27,500 inclusive. What is a single filer's tax bill if adjusted gross income is $20,100?
A. $2619 B. $4991 C. $2457 D. $3227
Mathematics
Add. Write the answer in lowest terms as a mixed number.
A. 8
B. 8
C. 7
D. 9
Mathematics
Determine the domain of the expression. Write the domain in interval notation.
A. (-?, 4) ? (4, ?) B. (-?, 7) ? (7, ?) C. (-?, -7) ? (-7, ?) D. (-?, ?)
Mathematics