Evaluate the improper integral or state that it is divergent.
A. Divergent
B. 1.569
C. -1.569
D. 0.193
Answer: D
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Calculate the derivative of the function. Then find the value of the derivative as specified.
? =1 if r = 
A. 
= 
; 
? =1
= 
B. 
= - 
; 
? =1
= - 
C. 
= - 
; 
? =1
= - 
D. 
= 
; 
? =1
= 
Find an equation for the circle.Center (18, 21), tangent (touching at one point) to the x-axis
A. (x - 18)2 + (y - 21)2 = 324 B. (x - 21)2 + (y - 18)2 = 21 C. (x - 21)2 + (y - 18)2 = 324 D. (x - 18)2 + (y - 21)2 = 441
Solve.The function f(x) = 300(0.5)x/50 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. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 125 pounds B. 168 pounds C. 180 pounds D. 131 pounds
Perform the indicated operations. Write the resulting polynomial in standard form.(4x + 2)(4x - 2)
A. 4x2 - 16x - 4 B. 16x2 - 16x - 4 C. 16x2 + 16x - 4 D. 16x2 - 4