Estimate. Then find the actual product.(71.61)(19.21)
A. Estimate: 1410; Actual: 1374.6281
B. Estimate: 140; Actual: 13,756.281
C. Estimate: 1400; Actual: 1375.6281
D. Estimate: 140; Actual: 137.56281
Answer: C
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Find all the second order partial derivatives of the given function.f(x, y) = ex/y
A. 
= 
; 
= ex/y
; 
= 
= -ex/y
B. 
= 
; 
= -ex/y
; 
= 
= ex/y
C. 
= 
; 
= 
; 
= 
= 
D. 
= 
; 
= ex/y
; 
= 
= -ex/y
Solve the problem.The position of a body moving on a coordinate line is given by 
with s in meters and t in seconds. When, if ever, during the interval 
does the body change direction?
A. t = 18 sec B. t = 9 sec C. t = 4.5 sec D. no change in direction
Solve the problem.78 is 10% of what?
A. 780 B. 78 C. 7.8 D. 7800
The pictograph shows the number of bicyclists who participated in the Labor Day weekend bicycle race for the years indicated. 
In what year did the least number of cyclists participate?
A. 2005 B. 2007 C. 2004 D. 2003