Solve the problem.The function A = Aoe-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 600 pounds of the material are placed in the vault, how much time will need to pass for only 99 pounds to remain?
A. 140 years
B. 260 years
C. 130 years
D. 135 years
Answer: C
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = (7cos3 8t)j + (7sin3 8t)k; 
? ? t ? 
?
A. 
B. 
C. 0
D. 21
Use colored counters to answer the question. Typically, black counters represent a profit or a positive number, while red counters represent a loss or a negative number. Here, use white in place of red, that is, consider a white counter to mean what a red counter would in the typical case.How many black counters and how many red counters (shown here in white) are there in a triangular array like this but with 16 rows?
What will be an ideal response?
Find the special products using patterns.(3x - 9)(3x + 9)
A. 9x2 - 54x - 81 B. 9x2 + 54x - 81 C. 9x2 - 81 D. 3x2 + 54x - 81
Plot the complex number in the complex plane.-5i 
A. 
B. 
C. 
D. 