Find the derivative of the function at the given point in the direction of A.
A = 4i - 3j
A. - 
B. - 
C. - 
D. - 
Answer: B
Mathematics
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Find the equation of the parabola satisfying the given conditions. The vertex is at the origin.Directrix x = -7
A. y2 = 28x
B. y = 
x2
C. 28y = x2
D. y2 = -28x
Mathematics
Perform the indicated operation and express the answer in decimal notation.(1.2 × 107)(7 × 10-4)
A. 8400 B. 8.4 C. 84 D. 840
Mathematics
Divide.9 ÷ (4i)
A. - 
i
B. - 
i
C. 
i
D. 
i
Mathematics
Solve.An express train travels 252 miles between two cities. During the first 
of a trip, the train traveled through mountainous terrain. The train traveled 
per hour slower through mountainous terrain than through level terrain. If the total time to travel between the cities was 6 hours, find the speed of the train on level terrain.
A. 62 mph B. 32 mph C. 17 mph D. 47 mph
Mathematics