The amount D, in milligrams, of a drug in the bloodstream t minutes after injection is given by
.
?
There are two times when there are 7 milligrams of the drug in the bloodstream. Find both times. Round your answer to two decimal places if necessary.
A. There are never 7 milligrams of the drug in the blood.
B. 
and 
C. 
and 
D. 
and 
Answer: C
Mathematics
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Transform the equation to a form without an xy-term by a rotation of axes and then identify the curve.x2 + 2xy + y2 - 4x + 4y = 0
A. x'2 + 2
y' = 0; parabola
B. x'2 + 2
y' = 0; ellipse
C. x'2 - 2
y'2 = 0; hyperbola
D. x'2 - 2
y' = 0; parabola
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Solve the equation.7r + 5 = 26
A. 18 B. 1 C. 14 D. 3
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When the midpoints of the sides of a quadrilateral are joined in order, the quadrilateral formed is always a square.
Answer the following statement true (T) or false (F)
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Find the product.[(3x - y) + 4z][(3x - y) - 4z]
A. 9x2 + y2 - 16z2 B. 9x2 - 6xy + y2 - 16z2 C. 9x2 - 6xy + y2 + 24xz + 8yz - 16z2 D. 9x2 + y2 + 24xz + 8yz - 16z2
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