Solve the problem.Find the half-life of the radioactive element radium, assuming that its decay constant is 
with time measured in years.
A. 1400 years
B. 1600 years
C. 800 years
D. 2308 years
Answer: B
Mathematics
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Find the unit tangent vector of the given curve.r(t) = (4 sin3 2t)i + (4 cos3 2t)j
A. T = (4 cos 2t)i - (4 sin 2t)j B. T = (4 sin 2t)i - (4 cos 2t)j C. T = (24 sin 2t)i -(24 cos 2t)j D. T = (sin 2t)i - (cos 2t)j
Mathematics
Simplify.
÷ 
- 
A. 
B. 
C. 
D. 
Mathematics
Find the vertices of the hyperbola.36y2 - x2 + 360y - 6x + 855 = 0
A. (-3, -4) and (-3, -6) B. (-9, -5) and (3, -5) C. (-3, 5) and (9, 5) D. (3, 6) and (3, 4)
Mathematics
Find the exact value of the indicated trigonometric function of ?.csc ? = - 
, ? in quadrant IIIFind cot ?.
A. - 
B. - 
C. 
D. - 
Mathematics