Find the vertex of the graph of -4x² - 7x.
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Mathematics
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Consider the differential equation. A detailed direction field is not needed. Find the solutions that are constant, for all 
(the equilibrium solutions). In what regions are solutions increasing? Decreasing?y'(t) = (y - 7)(7 + y)
A. y = 7; increasing for 
> 7; decreasing for 
< 7
B. y = -7; increasing for 
< 7; decreasing for 
> 7
C. y = 7, y = -7; increasing for 
> 7; decreasing for 
< 7
D. y = 7, y = -7; increasing for 
< 7; decreasing for 
> 7
Mathematics
Simplify the expression.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
Mathematics
Simplify.
A. 0.5 B. 9.5 C. -9.5 D. undefined
Mathematics
Write the negation of the compound statement.
?
If 
, then 
?
A. 
B. ?
C. ?
D. ?
E. ?
Mathematics