Find the largest open intervals where the function is concave upward.f(x) = -3x2 + 18x + 16
A. (-?, 3)
B. (-?, ?)
C. (3, ?)
D. None
Answer: D
Mathematics
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Use the formula for 
to evaluate the expression.
A. 30,240 B. 5 C. 2 D. 252
Mathematics
Provide an appropriate response.Twenty-one months is equal to 
of a year.
A. True B. False
Mathematics
Use the given information to find the exact value of the expression.sin ? = 
, ? lies in quadrant II, and cos ? = 
, ? lies in quadrant I
Find cos (? - ?).
A. 
B. 
C. 
D. 
Mathematics
After determining whether the variation model below is of the form 
or 
, find the value of k.
x
154
161
168
175
182
y
66
69
72
75
78
A. 
B. 
C. 
?
D. 
E. 
Mathematics