Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a half-life of approximately 850 years. How many years would be required for a given amount of this isotope to decay to 65% of that amount?
A. 297.5 yr
B. 1287 yr
C. 463 yr
D. 528 yr
Answer: D
Mathematics
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Solve the equation.4 - 5x = -6
A. {2}
B. 
C. {-2}
D. 
Mathematics
Solve and check.
- 
= 0
A. 
B. 
C. 
D. 
Mathematics
For the given functions f and g, find the requested composite function.f(x) = 4x2 + 3x + 5, g(x) = 3x - 6;
Find (g ? f)(x).
A. 4x2 + 3x - 1 B. 4x2 + 9x + 9 C. 12x2 + 9x + 21 D. 12x2 + 9x + 9
Mathematics
Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.The profit of Mythological Company last year was $458,000. This year's profit decreased by 3.3%. Find this year's profit.
A. $15,114.00 B. $442,886.00 C. $151,140.00 D. $306,860.00
Mathematics