Solve.The function A = A0e-0.0077x 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 300 pounds of the material are initially put into the vault, how many pounds will be left after 140 years?
A. 102 pounds
B. 96 pounds
C. 192 pounds
D. 233 pounds
Answer: A
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Graph the function and find the indicated limit.Graph the function f(x) and find 
f(x) or state that it does not exist.f(x) = 
A. 
f(x) does not exist
B. 
f(x) = - 1
C. 
f(x) does not exist
D. 
f(x) = - 1
Describe the mail-time situation that illustrates the computation, and state the answer.(-61) - 138
A. The mail carrier brings you a check for $61 and takes away a check for $138; 61 - 138 = -77 B. The mail carrier brings you a bill for $61 and takes away a check for $138; -61 - 138 = -199 C. The mail carrier brings you a bill for $61 and brings you a check for $138; -61 + 138 = 77 D. The mail carrier brings you a check for $61 and a check for $138; -199; 61 + 138 = 199
Find the area.
A. 424 in.2 B. 848 in.2 C. 512 in.2 D. 592 in.2
Divide. Simplify, if possible.16 ÷ 
A. 
B. 
C. 28
D. 4