Answer: The correct option is A.
Explanation:
The given equation is,

Multiply both sides by 2.
![2[4(x+5)-5]=\frac{8x+18}{2}](https://tex.z-dn.net/?f=2%5B4%28x%2B5%29-5%5D%3D%5Cfrac%7B8x%2B18%7D%7B2%7D)



Subtract both sides by 8x.

This statement is false for any value of x, therefore the system of equation have no solution and option A is correct.
Answer: 46.80
Step-by-step explanation:
20% of 39 = 7.80
39+7.80= 46.80
Answer:
The number of service calls made = 55
Step-by-step explanation:
Let the total number of installations made by the company = x
Let the total number of service calls = y
Total number of invoices for the month = 69
=>
-------------------(1)
Total amount of the invoices = $6975
=>
-----------(2)
From (1), ![\[y=69-x\]](https://tex.z-dn.net/?f=%5C%5By%3D69-x%5C%5D)
Substituting in (2):
=> ![\[400x+25*(69-x)=6975\]](https://tex.z-dn.net/?f=%5C%5B400x%2B25%2A%2869-x%29%3D6975%5C%5D)
=> ![\[400x+1725-25x=6975\]](https://tex.z-dn.net/?f=%5C%5B400x%2B1725-25x%3D6975%5C%5D)
=> ![\[375x=5250\]](https://tex.z-dn.net/?f=%5C%5B375x%3D5250%5C%5D)
=> ![\[x=14\]](https://tex.z-dn.net/?f=%5C%5Bx%3D14%5C%5D)
![\[y=69-x\]](https://tex.z-dn.net/?f=%5C%5By%3D69-x%5C%5D)
=> ![\[y=55\]](https://tex.z-dn.net/?f=%5C%5By%3D55%5C%5D)
Answer:
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