B 5x+20 hope this helps!!
 
        
             
        
        
        
Answer:
The distance across the lake is 3.5 km
Step-by-step explanation:
Hypotenuse is divided in equal parts. Thus both sides are divided in the same proportion.
 
        
                    
             
        
        
        
Answer:
6
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1
Step-by-step explanation:2 and 6 are the first ones in each set so 6-2 is 4.4 and 1 are the second ones in each set 1-4 is -3 4+-3 is 1.
 
        
             
        
        
        
Part 1) 
we have
 ------> equation A
 ------> equation A
 ------> equation B
 ------> equation B
Multiply by  the equation A
 the equation A
 
 
 ------> equation C
 ------> equation C
Multiply by  the equation B
 the equation B

 -------> equation D
 -------> equation D
Adds equation C and equation D

therefore
<u>the answer Part 1) is the option A </u>

Part 2) 
we have
 
 
 ------> equation A
 ------> equation A

Simplify Divide by  both sides
 both sides

 ------> equation B
 ------> equation B
the lines A and B are parallel lines, because the slope m is equal
so
The system has no solution
therefore
<u>the answer Part 2) is the option D</u>
There is no x value as there is no solution to the system. 
Part 3) 
we have
 ------> equation A
 ------> equation A

 ------> equation B
  ------> equation B
substitute equation B in equation A
![4x+2[x-3]=6](https://tex.z-dn.net/?f=4x%2B2%5Bx-3%5D%3D6)



therefore
<u>the answer part 3) is the option D</u>

Part 4)
 Let
x---------> The number of one-step equations 
y---------> The number of two-step equations 
we know that

 -------> equation A
 -------> equation A
 ------> equation B
 ------> equation B
substitute equation A in equation B
![3[1,120-y]-2y=1,300](https://tex.z-dn.net/?f=3%5B1%2C120-y%5D-2y%3D1%2C300)




therefore
<u>the answer part 4) is  the option D</u>
