Express the sum or difference as a product.cos 
+ cos 
A. 2 cos 2x cos 
B. 2 sin 2x sin x
C. 2 cos 2x
D. 2 sin 2x sin 
Answer: A
Mathematics
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Solve the equation.-2 - 9p = 1
A. 
B. - 
C. 
D. 
Mathematics
Approximate the area of the triangle to the nearest tenth.
A. 130.5 B. 127.5 C. 124.5 D. 121.5
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Find the focus and directrix of the parabola with the given equation.y2 = 36x
A. Focus: (0, 9), directrix: y = -9 B. Focus: (9, 0), directrix: x = -9 C. Focus: (-9, 0), directrix: x = 9 D. Focus: (0, -9), directrix: y = 9
Mathematics
Solve the problem.A jet plane traveling at a constant speed goes 1200 miles with the wind, then turns around and travels for 1000 miles against the wind. If the speed of the wind is 50 mph and the total flight took 4 hours, find the speed of the plane.
A. 550 mph B. 435 mph C. 605 mph D. 525 mph
Mathematics