Answer: Probability theory is a branch of mathematics focusing on the analysis of random phenomena. It is an important skill for data scientists using data affected by chance. With randomness existing everywhere, the use of probability theory allows for the analysis of chance events.
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Answer:
Look below
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In Adam's expression, d represents the original price of the game. 0.75d represents 75% of the original price; this is the amount of the discount, since everything is 75% off.  Taking the difference of the original price and the discount, d-0.75d, gives us the total price of the game. In Rena's expression, 0.25 represents 25%.  This is because taking 75% off of the price means we still pay 100-75 = 25% of the original price. Multiplying the original price, d, by the 0.25, gives us 25% of the original price; this is the total price.
 
        
             
        
        
        
Answer:
I can't answer the whole question but the first one is 7 x 9, or 63 squares. And say you chose a square that is 4 x 3 so that would be the area of the tile you chose. Im sorry I couldn't answer the whole thing but I hope that makes since of what I did, if not please ask questions.
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line 1
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because 
3x + 2y + z = 11 ➡ z = 11 - 3x - 2y 
3x and 2y must change sign when transfer to other sid eof equation 
 
        
             
        
        
        
P = $13000, r =6% = 0.06 per year, t = 90 days =  90/360 = 0.25 year 
Interest , I = Prt
Interest , I = 13000*0.06*0.25 = 195
Interest owed = $195