Answer:
![\left[\begin{array}{ccc}10&0&0\\14&25&0\\57&18&39\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D10%260%260%5C%5C14%2625%260%5C%5C57%2618%2639%5Cend%7Barray%7D%5Cright%5D)
Explanation:
A lower triangular matrix is one whose elements above the main diagonal are zero meanwhile all the main diagonals elements and below are nonzero elements. This is one of  the two existing types of triangular matrixes. Attached you will find a image referring more about triangular matrixes. 
If there is any question, just let me know. 
 
        
             
        
        
        
Answer:
The three phase full load secondary amperage is 2775.7 A
Explanation:
Following data is given, 
S = Apparent Power = 1000 kVA
No. of phases = 3 
Secondary Voltage: 208 V/120 V <em>(Here 208 V is three phase voltage and 120 V is single phase voltage) </em>
<em>Since,</em>
<em />
<em /> <em />
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The formula for apparent power in three phase system is given as:

Where:
S = Apparent Power
V = Line Voltage
I = Line Current
In order to calculate the Current on Secondary Side, substituting values in above formula,

  
 
        
             
        
        
        
Answer:
Dalton
The part of the close-out report that would describe how he would plan and manage projects in the future is:
summary of project management effectiveness
Explanation:
The Project Close-out Report is a project management document, which identifies the variances from the baseline plans.  These variances are specified in terms of project performance, project cost, and schedule.  The project close-out report records the completion of the project and the subsequent handover of project deliverables to others.  The project management effectiveness summary details the project's objectives and the achievements recorded, including the lessons learned.
 
        
             
        
        
        
Answer:
 44.95 tonnes
Explanation:
According to principle of buoyancy the object will just sink when it's weight is more than the weight of the liquid it displaces
It is given that empty weight of box = 40 tons
Let the mass of the stones to be placed be = M tonnes
Thus the combined mass of box and stones = (40+M) tonnes..........(i)
Since the box will displace water equal to it's volume V we have 
 
 

Now the weight of water displaced =  is density of water = 1000kg/
 is density of water = 1000kg/
Thus weight of liquid displaced =  ..................(ii)
..................(ii)
Equating i and ii we get 
40 + M = 84.95
thus Mass of stones = 44.95 tonnes
 
        
             
        
        
        
That is a thread ball valves