Solve the problem.The function y = 800e-0.00866x 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 800 pounds of the material are placed in the vault, how much time will need to pass for only 283 pounds to remain?
A. 125 years
B. 120 years
C. 240 years
D. 130 years
Answer: B
Mathematics
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Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.sec ? = 4, 0 < ? < 
Find cos 
.
A. 
B. 
C. 
D. 
Mathematics
Solve for x. Check your answers.x - 3 = -2
A. x = 1 B. x = 5 C. x = -5 D. x = -1
Mathematics
Simplify. Assume that all variables represent any real number.
A. -
B. x - 2
C. 
D. -x + 2
Mathematics
Find the x- and y-intercepts. If no x-intercepts exist, state so.f(x) = 4x2 + 10x + 3
A. 
, (0, 3)
B. 
, (0, 3)
C. 
, (0, -3)
D. 
, (0, -3)
Mathematics