Answer:The x could just mean a variable but I don't know what F means sorry.
Step-by-step explanation:
$54 towe my friend degrees
Answer:
Do you want the derivative?!
Answer:

Step-by-step explanation:
<u>Step 1: Find the slope</u>
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<u>Step 2: Use point slope form</u>
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Answer: 
Answer:
8 hours
$480
Step-by-step explanation:
Let us assume the hours be x
There should be two equations
For Plumber A = 60x
For Plumber B = 40 + 55x
Now in order to considered the cost to be the same we equate these two equations
60x = 40 + 55x
5x = 40
x = 8 hours
Now the total cost for plumber A is
= 480
And, the total cost for plumber B is
= 40 + 55(8)
= 480
hence, the total cost is $480