Solve the problem.In a study of heat transfer in a grid of wires, the temperature at an exterior node is maintained at a constant value (in °F) as shown in the figure. When the grid is in thermal equilibrium, the temperature at an interior node is the average of the temperatures at the four adjacent nodes. For instance 
Find the temperatures T1, T2, and T3 when the grid is in thermal equilibrium. 
132°180°
A. T1 = 194, T2 = 88, T3 = 
B. T1 = 97, T2 = 88, T3 = 
C. T1 = 
, T2 = 
, T3 = 
D. T1 = 
, T2 = 
, T3 = 
Answer: D
Mathematics
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Perform the indicated conversion between American and metric units of length.19 kilometers to miles (Round to the nearest tenth.)
A. 20.1 B. 18.0 C. 30.6 D. 11.8
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Find the sum.
+ 
A. 
B. 
C. 
D. 
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Divide and simplify.
÷ 
A. 
B. -1
C. x - y + 4
D. 
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Solve the equation by completing the square. Express any complex numbers using i notation.5x2 + 12x + 4 = -1
A. x = 
B. x = 
C. x = 
D. x = 
Mathematics