Convert the units using unit fractions.225 sec = 
min
A. 2250
B. 3
C. 13,500
D. 3
Answer: D
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Calculate the flux of the field F across the closed plane curve C.F = y2i + x3j; the curve C is the closed counterclockwise path formed from the semicircle 
0 ? t ? ?, and the straight line segment from (-5, 0) to (5, 0)
A. - 
B. 0
C. 
D. 125
What angle is opposite AB?
(a) ?A
(b) ?C
(c) ?ABC
(d) ?CBD
Decide whether the statement is always true, sometimes true, or never true.The sum of a positive number and a negative number is 0.
A. Never true B. Always true C. Sometimes true
Use calculus to find any critical points and inflection points of the given function. Then determine the concavity of the function and the intervals over which it is increasing/decreasing.f(x) = e-2x
A. Critical points: critical point at x = 0 Inflection points: none Concavity: concave up for all real numbers Increasing: increasing for all x < 0 and decreasing for all x > 0 B. Critical points: none Inflection points: none Concavity: concave down for all real numbers Decreasing: decreasing for all real numbers C. Critical points: none Inflection points: point of inflection at x = 0 Concavity: concave down for all x < 0 and concave up for all x > 0 Decreasing: decreasing for all real numbers D. Critical points: none Inflection points: none Concavity: concave up for all real numbers Decreasing: decreasing for all real numbers