Use the inverse trig functions to express the angle in terms of the indicated unknown side. 
Express angle A in terms of b. Use one of the inverse trig functions tan-1, sin-1, or cos-1.
A. A = cos-1 
B. A = sin-1 
C. A = sin-1 
D. A = tan-1 
Answer: A
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Solve the problem.The distance d in miles that can be seen on the surface of the ocean is given by 
where h is the height in feet above the surface. How high (to the nearest foot) would a platform have to be to see a distance of 20.5 miles?
A. 420 ft B. 588 ft C. 214 ft D. 146 ft
Solve the problem.The area of the base B and the height h of a pyramid are related to the pyramid's volume V by the formula 
How is dV/dt related to dh/dt if B is constant?
A. 
= 
B. 
= 
C. 
= B
D. 
= 
Solve the system by substitution.x = 3y + 7y = x - 5
A. (-4, -1) B. (-4, 1) C. (4, -1) D. (4, 1)
Solve the problem.Newton's Universal Law of Gravitation states that the attractive force exerted on one spherically symmetric object of mass M by a second spherically symmetric object of mass m is given by 
where r is the distance between the centers of the two objects and G is a constant equal to 
when F is in newtons (N), M and m are in kilograms (kg), and r is in meters (m). What is the magnitude of the gravitational force exerted on an object of mass 1 kg by an object of mass 10 kg if the objects are 1 m apart?
A. 6.67 × 10-12 N B. 6.67 × 10-10 N C. 1 × 10-10 N D. 1 × 10-7 N