Find the length of the indicated portion of the trajectory.r(t) = (1 + 2t)i + (1 + 7t)j + (4 - 4t)k, -1 ? t ? 0
A. 2
B. 
C. 
D. 
Answer: D
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Solve the problem.It has been found that the less income people have, the more likely they are to report that their health is fair or poor. The function 
models the percentage of Americans reporting fair or poor health, f(x), in terms of annual income, x, in thousands of dollars. Find and interpret f(31).
A. f(31) ? 13.5; 13.5% of Americans earning $31 thousand annually report fair or poor health. B. f(31) ? 14.6; 14.6% of Americans earning $31 thousand annually report fair or poor health. C. f(31) ? $14.6; 31% of Americans earning $14.6 thousand annually report fair or poor health. D. f(31) ? 13.5; 31% of Americans earning $13.5 thousand annually report fair or poor health.
Provide an appropriate response.Write the equation of the line shown on the graph.
A. y = 
x - 1
B. y = 2x + 2
C. y = 
x + 2
D. y = 2x -1
Use the fundamental identities to simplify the expression.cos (-x) cos x - sin (-x) sin x
A. cos2x sin2x B. 0 C. 2 D. 1
Solve the system of equations.4x+ y- 
z=42
x- 2z=15x- 4y=1
A. (-6, 3, -5) B. (13, 3, -6) C. (9, 2, -6) D. (13, 20, -9)