Estimate the sum as indicated. Then answer the question.Estimate the following sum by first rounding to the nearest hundred. Does the estimate give you reason to doubt the stated sum?
A. Estimate: 126,200 ; yes
B. Estimate: 126,200 ; no
C. Estimate: 126,400 ; no
D. Estimate: 126,400 ; yes
Answer: B
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Verify the integration formula.
csch-1 x + 
+ C
A. No B. Yes
Use a calculator with a 
key or a 
key to solve the problem.Research suggests that the probability of a certain fuse malfunctioning increases exponentially as the concentration of an impurity in the fuse increases. The probability is modeled by the function y = 4(257,911)x, where x is the impurity concentration, and y, given as a percent, is the probability of the fuse malfunctioning. Find the probability of the fuse malfunctioning for an impurity concentration of 0.12. Round to the nearest percent.
A. 4% B. 12% C. 30% D. 18%
Rewrite the given integral so that it fits the form 
, and identify u, du, and n.
A. 
; u = e4x + 1, du = 4e4x dx, n = -1/2
B. 
; u = e4x, du = 4e4x dx, n = -1/2
C. 
; u = 
, du = e4x dx, n = -1
D. 
; u = e4x + 1, du = e4x dx, n = -1/2
Find the foci of the ellipse whose equation is given.9(x - 2)2 + 16(y + 2)2 = 144
A. foci at (- 
, -2) and (
, -2)
B. foci at (2 + 
, -2) and (2 - 
, -2)
C. foci at (-2 + 
, 2) and (-2 - 
, 2)
D. foci at (2 + 
, 2) and (2 - 
, 2)