<span>Z=15+2(x+y) 
Use distributive property
Z= 15 + 2x + 2y
Subtract 2y from both sides
Z - 2y= 15 + 2x
Subtract 15 from both sides
Z - 2y - 15= 2x
Divide 2 on both sides
Final Answer: Z - 2y - 15(All over 2)= x</span>
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
The probability that Boris is assigned a moderate-difficulty question would be the ratio of number of moderately difficult questions to the number of total questions available.
The quiz consists of 2 high difficulty, 7 moderate difficulty, and 6 low difficulty questions. That is 2 + 7 + 6 = 15 questions in total. 
and
the number of moderately difficult questions is 7
Hence the probability would be 7/15
 
        
             
        
        
        
It’s b) an =-125(-^2/5)^n
        
             
        
        
        
2[4 − 7(3x + 4y)] + 2[3x(−2y)]
 2[4 - 21x -28y] + 2[-6xy]
 8 - 42x - 56y -12xy
the perimeter of given rectangular garden is (8 - 42x - 56y -12xy).