Whats the problem? just substitute. For example: 3x-5 if x=4 so what you do is this; 3(4)-5=7
Answer:
I'm not 100% sure I'm right but I think x = -1
because it says "f(x)" and then it says"Find f(-1)" so that is why I think x = -1
The answer is: "72" .
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(input value, or "x") / 10 = y = f(x);
When y = 7.2, what is the value of "x" ?
x / 10 = 7.2 ;
x = (7.2) * 10 = 72 .
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Answer:
--- function
The monthly rate is 10%
Step-by-step explanation:
Given
Let
So, we have:
--- Monday
--- One month later
Required
The function
The function is represented as:
In , we have:
In , we have:
Substitute:
Solve for b
So, the function is:
To calculate the monthly rate (r), we have:
Compare to: 
Make r the subject
Substitute
Express as percentage
Answer: 7 gallons decrease per minute
Step-by-step explanation:
56 gallons / 8 minutes = 7 gallons per minute
to make sure do it backwards: 7 gallons x 8 minutes = 56 gallons :)
