Solve the problem.The half-life of an element is 3.9 × 1012 yr. How long does it take a sample of the element to decay to 
of its original mass? Express results in scientific notation, rounded to the nearest hundredth.
A. 8.70 × 1011 yr
B. 2.48 × 1012 yr
C. 5.16 × 1012 yr
D. 3.39 × 1012 yr
Answer: C
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Multiply the rational expressions. 
? 
A. 
B. 
C. 
D. 
Decide whether or not the ordered pair is a solution to the equation.5x - 4y = 40; (4, 5)
A. Yes B. No
Solve the problem.When determining appropriate doses of medication, it is sometimes important to estimate the body surface area (BSA) of a patient. This surface area (in m2) can be approximated using the Mosteller formula BSA = 
1/2, where h is the patient's height in centimeters and w is the weight in kilograms. Determine the BSA for a patient with height 172 cm and weight 90 kg. Round your answer to two decimal places.
A. 0.03 m2 B. 2.07 m2 C. 18.49 m2 D. 4.30 m2
For the pair of functions, perform the indicated operation.f(x) = 2x - 2, g(x) = 5x - 8
Find (f - g)(x).
A. 7x - 10 B. 3x - 6 C. -3x - 10 D. -3x + 6