Solve the problem.A crosswalk diagonally crosses a street whose curbs are 48 feet apart. The width of the crosswalk is 15 feet. The crosswalk intersects the south side of the street with a 20 foot displacement in the direction of the street. (In other words, the point where one edge of the sidewalk intersects the south side of the street lies 20 feet east of the point where that edge of the crosswalk intersects the north side of the street.) What is the area of the crosswalk?
A. 720 ft2
B. 780 ft2
C. 750 ft2
D. 845 ft2
Answer: B
Mathematics
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Solve the problem.A bird flew 39 feet in 2.7 seconds. How many feet per second did the bird fly? Round to the nearest tenth.
A. 0.1 ft/sec B. 105.3 ft/sec C. 14.4 ft/sec D. 36.3 ft/sec
Mathematics
Find the indicated derivative of the function.f(4)(x) for f(x) = 3
A. - 
B. 
C. - 
D. 
Mathematics
Find a rectangular equation for the plane curve defined by the parametric equations.x = 5 cos t, y = -2 sin t; 0 ? t ? 2?
A. 4x2 - 25y2 = 100; x ? 5
B. 4x2 + 25y2 = 1; - 
? x ? 
C. 4x2 - 25y2 = 1; x ? 
D. 4x2 + 25y2 = 100; -5 ? x ? 5
Mathematics
Solve the inequality by the test-point method. Write the solution in interval notation.x3 ? 64
A. [-4, 4] B. (-?, -4] ? [4, ?) C. [4, ?) D. (-?, 4]
Mathematics