Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = 5ti + 5tj + 7t2k, 0 ? t ? 1; ?(x, y, z) = 
A. 
B. 
C. 
D. 
Answer: C
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Graph the equation.(x - 2)2 + (y - 4)2 = 4
A. 
B. 
C. 
D. 
Find the amount of taxable income and the tax owed. The letter following the name indicates the marital status, and all married people are filing jointly. Use $3700 for each personal exemption; a standard deduction of $5800 for single people, $11,600 for married people filing jointly, $5800 for married people filing separately, and $8500 for head of a household; and the following tax rate schedule. 
A. $24,814; $3297.10 B. $21,114; $2742.10 C. $26,914; $3612.10 D. $23,497; $3099.55
Find the exact value of the expression or state that it does not exist.cos (cos-1 0.6)
A. 2.5 B. 3.7 C. 0.6 D. 0.8
Write an equation to describe the variation. Use k for the constant of proportionality.P varies jointly as the square of R and the square of S.
A. P = k + R2 + S2 B. PR2S2 = k C. P + R2 + S2 = k D. P = kR2S2