Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = 4ti + 8tj + 7t2k, 0 ? t ? 1; ?(x, y, z) = 
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Simplify using the laws of exponents.(44a)5
A. 420a5 B. 49a5 C. 44a5 D. 49a
Mathematics
In a certain city there is a river running through the middle of the city. There are three islands and seven bridges as shown in the figure below.
In the graph that models this situation, the degree of the vertex that represents island A is
A. 3. B. 2. C. 1. D. 4. E. none of these
Mathematics
Provide an appropriate response.If the volume of a cylinder is v = ?r2h and r = 4m and h = 12 m, then V = __________.
A. 1810 cu. m B. 126 cu. m C. 7238 cu. m D. 603 cu. m
Mathematics
Divide and simplify.
÷ 
A. - 
B. - 
C. - 
D. - 
Mathematics