Solve the problem.The function A = A0e-0.01386x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 900 pounds of the material are placed in the vault, how much time will need to pass for only 65 pounds to remain?
A. 380 yr
B. 190 yr
C. 195 yr
D. 200 yr
Answer: B
Mathematics
You might also like to view...
Plot the parametric surface over the indicated domain.r(u, v) = 3cos vi + 4sin vj + uk; -7 ? u ? 7, 0 ? v ? 2?
A. 
B. 
C. 
D. 
Mathematics
Choose the graph that represents the given function without using a graphing utility.f(x) = 
A. 
B. 
C. 
D. 
Mathematics
Multiply.(2y2 - 10)(2y2 + 10)
A. 4y4 - 40y2 + 40 B. 4y2 + 100 C. 4y4 - 40y2 - 100 D. 4y4 - 100
Mathematics
Given that P varies jointly with r and s and 
when 
and 
class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_92d370417b884147a540e489b" />, find P when 
and 
.
?
A. ?
B. 
C. ?
D. ?
E. ?
Mathematics