Solve the problem.A sample of 250 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 20 years? Round to the nearest whole gram.
A. 0 grams
B. 524 grams
C. 96 grams
D. 1 gram
Answer: C
Mathematics
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. (72)-1
A. 
B. - 
C. -14
D. -49
Mathematics
Find all solutions.x3 + 2x2 - x - 2 = 0
A. {1, -2, 2} B. {-1, 1, -2} C. {4} D. {-2, 2}
Mathematics
Use a graphing calculator to graph the hyperbola.2.7x2 - 5y2 = 13
A. y = ±
B. y = ±
C. y = ±
D. y = ±2.7
Mathematics
Identify the leading term and leading coefficient of the polynomial.6a2 + 13a5 - 8a
A. 6a2, 6 B. -8a5, -8 C. 13a5, 13 D. -8a, -8
Mathematics