Find the center of mass of a thin plate covering the given region with the given density function.The region between the x-axis and the curve y = 
, 1 ? x ? 2, with density ?(x) = 
A. 
= 
, 
= 1
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Answer: D
Mathematics
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Solve the problem.The current in a simple electrical circuit is given by I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. When V = 12 volts, what is a 12? resistor's tolerance for the current to be within 1 ± 0.01 amp?
A. 0.1% B. 1% C. 0.01% D. 10%
Mathematics
Divide. Simplify, if necessary.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Graph the polynomial function. f(x) = x4 - 18x3 + 81x2
A. 
B. 
C. 
D. 
Mathematics
Using the factors (x - 4) and (x + 2), find the remaining factor(s) of 
and write the polynomial in fully factored form.
A. 
B. 
C. 
D. 
E. 
Mathematics