Find the critical number(s), if any, of the function 
a. 4
b. ?4
c. ±?7
d. ±7
c. ±?7
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Find the probability of the given event if a year is selected at random.Memorial Day falls on a Monday.
A. 1
B. 
C. 
D. 0
Solve the problem.A man has 3 shirts and 7 ties. How many different shirt and tie arrangements can he wear?
A. 42 B. 49 C. 9 D. 21
Determine the intervals on which the following polynomial is entirely negative and those on which it is entirely positive.
A. entirely negative: 
; entirely positive: 
B. entirely negative: 
; entirely positive: 
C. entirely negative: 
; entirely positive: 
D. entirely negative: 
; entirely positive: 
E. entirely negative: 
; entirely positive: 
Solve.In the land of Taxalot, the function T(x) = 0.21(x - 9200) + 760 represents the tax bill T of a single person whose adjusted gross income is x dollars for incomes between 9200 and 30,200 inclusive. What is a single filer's tax bill if adjusted gross income if their tax bill is $1558?
A. $13,000 B. $12,900 C. $14,000 D. $13,200