Solve the problem.The half-life of an element is 5.8 x 108 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. 4.27 x 108 yr
B. 6.13 x 108 yr
C. 1.06 x 108 yr
D. 2.05 x 108 yr
Answer: A
Mathematics
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A. 
B. 
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For the given pair of functions, find the requested function.f(x) = 5x - 4 and g(x) = -9x2 - 14x + 9; (f + g)(x)
A. 9x2 - 4x - 13 B. -9x2 - 9x + 5 C. -10x2 - 9x - 5 D. -9x2 + 9x + 5
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A. 
B. 
C. - 
D. 
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Solve the equation. Express radicals in simplest form.y2 = 13
A. 6.5
B. ±
C. 
D. 169
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