Solve the problem.Find the complement of an angle whose measure is 
.
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (5t - 4t3)i + 2tan(3t)j + e4tk
A. a
= 2?i + 72j + 16e1/3?k
B. a
= - 2?i + 72j + 16e1/3?k
C. a
= - 2?i - 72j + 16e1/3?k
D. a
= - 2?i - 72j + 16k
Mathematics
Complete.399 ft = 
m (Round to the nearest tenth.)
A. 443.3 B. 133.0 C. 1197 D. 120.9
Mathematics
Subtract.140 - 300
A. 160 B. -440 C. -160 D. 440
Mathematics
The sequence is defined recursively. Write the first four terms.a1 = 1 and an = an-1 - 3 for n ? 2
A. 1, -2, -5, -8 B. 1, 0 , -3 , -6 C. -3, -6, -9, -12 D. 1, 4 , 7 , 10
Mathematics