Find the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Answer: C
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) = (10 sin 3t)i - (3 cos 3t)j + (10 csc 3t)k
A. a
= 90i + 90k
B. a
= -90i + 90k
C. a
= -90i - 90k
D. a
= 27j + 90k
Mathematics
Convert the given number to scientific notation.0.000426
A. 4.26 × 10-3 B. 4.26 × 10-4 C. 4.26 × 10-5 D. 4.26 × 104
Mathematics
Write the augmented matrix for the system.-2x + 3y + 6z = 44 2x - 2y + 6z = 46 6x + 3y + 4z = 94
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The decay of 923 mg of an isotope is given by A(t)= 923e-0.027t, where t is time in years. Find the amount left after 76 years.
A. 119 B. 898 C. 115 D. 60
Mathematics