Add or subtract.15
+ 9
A. 24
B. 25
C. 15
D. 23
Answer: A
Mathematics
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Find 
and 
.f(x, y) = ln yx
A. 
= ln y; 
= - xln y
B. 
= ln y; 
= 
C. 
= 0; 
= - 
D. 
= xln y; 
= - 
Mathematics
Calculate the flux of the field F across the closed plane curve C.F = xi + yj; the curve C is the circle (x - 8)2 + (y + 9)2 = 9
A. 18? B. 18? + 24 C. 0 D. 2?
Mathematics
Solve the problem.Find the standard form of the equation of the circle. Assume that the center has integer coordinates and the radius is an integer. 
A. (x - 1)2 + (y + 2)2 = 9 B. x2 + y2 - 2x + 4y - 4 = 0 C. x2 + y2 + 2x - 4y - 4 = 0 D. (x + 1)2 + (y - 2)2 = 9
Mathematics
Convert the units using unit fractions.10,000 lb = 
tons
A. 5
B. 6
C. 5
D. 4
Mathematics