Solve the problem.A ray of light is moving from air into glass. If its angle of incidence is 10°, find its angle of refraction. The indices of refraction of air and glass are 1.000293 and 1.571, respectively.
A. 15.82°
B. 6.35°
C. 13.92°
D. 6.98°
Answer: B
Mathematics
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Use Descartes' rule of signs to find the number of possible positive, negative, and nonreal roots for the following equation.
?
?
A. 1 positive; 1 negative; 7 nonreal B. 1 positive; 0 negative; 8 nonreal C. 0 positive; 1 negative; 8 nonreal D. 0 positive; 0 negative; 9 nonreal E. none of these
Mathematics
Verify the identity.
= - 
What will be an ideal response?
Mathematics
If y varies inversely as x, write a general formula to describe the variation.y = 8 when x = 2
A. y = 
B. y = 4x
C. y = 
D. y = 
Mathematics
Solve the nonlinear system.x2 + y2 = 81 y = x - 9
A. (0, -9), (0, 9), (-9, 0), (9, 0) B. (0, 9), (-9, 0) C. (0, -9), (9, 0) D. no real solution
Mathematics