Answer:

Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
or 
In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin
Let
x -----> the number of hours worked
y ----> the amount paid in dollars
In this problem we have a proportional variation, between two variables, x, and y
<em>Find out the constant of proportionality k</em>
For (5,300) ----->
----> 
For (4,240) ----->
----> 
For (6,360) ----->
----> 
The constant k is

The equation is equal to

The unit rate of change of dollars with respect to time is equal to the constant of proportionality or slope of the linear equation
therefore

The correct answer would be that Carl is 4 years old. If John is 20 years older than Carl, that would make him 24. 24 + 4 = 28 years. Therefore, Carl must be 4 years old.
Answer:
Estimate: 7
Actual: 6.63 (>)
Step-by-step explanation:
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