Multiply.
? 
A. 
B. 
C. 
D. 
Answer: C
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Compute r''(t).r(t) = (cos 3t)i + (2 sin t)j
A. r''(t) = (-3 cos 3t)i + (2 sin t)j B. r''(t) = (-9 cos 3t)i + (-4 sin t)j C. r''(t) = (9 cos 3t)i + (-2 sin t)j D. r''(t) = (-9 cos 3t)i + (-2 sin t)j
Use the given vectors to find the indicated expression.v = -2i - 5j - 4k, w = 3i - 4j + 2kFind v × (5w).
A. -66i + 8j + 55k B. -90i - 56j + 83k C. 130i + 10j - 115k D. -130i - 40j + 115k
Write the equation in standard form of the line through the given points.(-9, -2) and (2, 6)
A. 7x + 4y = -10 B. 8x - 11y = -50 C. -7x - 4y = -10 D. -8x - 11y = -50
Solve the problem.Two hikers on opposite sides of a canyon each stand precisely 525 meters above the canyon floor. They each sight a landmark on the canyon floor on a line directly between them. The angles of depression from each hiker to the landmark meter are 37° and 21°. How far apart are the hikers? Round your answer to the nearest whole meter.
A.
| 2063 m |
B. 2065 m
C. 1064 m
D. 2064 m