Solve the problem.A sample of 900 g of lead-210 decays to polonium-210 according to the function given by 
where t is time in years. What is the amount of the sample after 70 years (to the nearest g)?
A. 70 g
B. 39 g
C. 8454 g
D. 96 g
Answer: D
Mathematics
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Graph the set of points whose polar coordinates satisfy the given equation or inequality.2 ? r ? 5
A. 
B. 
C. 
D. 
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Write your answer in lowest terms.There are 100 centimeters to a meter. What fraction of a meter is 20 centimeters?
A. 5
B. 
C. 
D. 
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Determine the symmetries of the curve.r = 16 cos 8?
A. y-axis only B. x-axis only C. No symmetry D. x-axis, y-axis, origin
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Solve the problem.Find the slope, m1, of line l1, where 4 = m2 is the slope of line l2 and ? = 45° is the smallest positive angle from l1 to l2.
A. 
B. 
C. 
D. 1
Mathematics