Solve the problem.The concentration of a certain drug in the bloodstream x hr after being administered is approximately 
Use the differential to approximate the change in concentration as x changes from 1 to 1.07.
A. 0.28
B. 0.49
C. 0.40
D. 0.03
Answer: D
Mathematics
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Simplify.[-12 - (-4)] ÷ 4
A. 4 B. 2 C. -4 D. -2
Mathematics
Identify the correspondence.The two triangles shown below are congruent. List the sides corresponding to 
, 
, and 
in order.
A. 
, 
and 
B. 
, 
and 
C. 
, 
and 
D. 
, 
and 
Mathematics
Decide whether the ordered pair is a solution of the given system.(-5, 3)2x + y = -73x + 2y = -9
A. No B. Yes
Mathematics
Provide an appropriate response.In converting mixed numbers to improper fractions, the numerator of the improper fraction will be the same as the numerator of the fractional part of the mixed number.
A. True B. False
Mathematics