Solve the problem.An airplane is sighted at the same time by two ground observers who are 3 miles apart and both directly west of the airplane. They report the angles of elevation as 15° and 
How high is the airplane?
A. 4.03 mi
B. 0.78 mi
C. 1.03 mi
D. 3.05 mi
Answer: D
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Evaluate the line integral along the curve C.
ds , C is the path from (0, 0, 0) to (1, 1, 1) given by:C1: r(t) = ti, 0 ? t ? 1C2: r(t) = i + tj, 0 ? t ? 1C3: r(t) = i + j + tk, 0 ? t ? 1
A. -41 + 5e5 + ln 2 B. -25 + e5 C. -19 + e5 D. -36 + 6e5 + ln 2
Graph the inequality.4x + 6y > 24 
A. 
B. 
C. 
D. 
Divide the real numbers. Write any improper fraction as a whole or mixed number where appropriate.
A. -4 B. -2 C. -3 D. 3
Solve the problem. Assume the x-axis is horizontal, the positive y-axis is vertical (opposite g), the ground is horizontal, and only the gravitational force acts on the objects. A projectile is launched from level ground at a launch angle of 26° and an initial speed of 48 m/sec. How far away from the launch point does the projectile hit the ground?
A. ? 230 m B. ? 60 m C. ? 185 m D. ? 290 m