Solve the problem.Doctors use the rational expression 
to determine the dosage of a drug prescribed for children. In this expression, A = child's age and D = adult dosage. What is the difference in the child's dosage for a 12-year-old child and an 8-year-old child? Express the answer as a single rational expression in terms of D.
A. 27D
B. 
D
C. 
D
D. 
D
Answer: B
Mathematics
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Graph the pair of parametric equations with the aid of a graphing calculator.x = 3 cos t + cos 3t, y = 3 sin t - sin 3t, 0 ? t ? 2?
A. 
B. 
C. 
D. 
Mathematics
Simplify the fraction.
A. -4x11 B. -4x3 C. 4x11 D. 4x3
Mathematics
Simplify.
A. 
B. 100
C. 10
D. 
Mathematics
Round the decimal to the given place value.7.924 to the nearest tenth
A. 7.92 B. 8.0 C. 7.9 D. 7.8
Mathematics