Answer:
Option (4)
Step-by-step explanation:
We Fix it Computer Repair charges for it's services as per equation given as,
C = 30h + 90
Here, C = Total cost
h = Number of hours worked
This equation is in the form of a linear equation,
y = mx + b
Here, m = slope of the equation
And slope of the equation defines the unit rate
Therefore, charges for each hour of the first company = $30
Table given in the question represents the charges of another company John's Compute Repair.
There is a common difference in each successive term of the Total Cost of the table,
Common difference = 100 - 55 = 45
Therefore, this table represents a linear function.
Slope of the linear function passing through [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex] is given by the expression,
Slope = [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]
Slope of the function represented by the table = [tex]\frac{100-55}{2-1}[/tex]
= 45
Therefore, per hour charges by the second company = $45
Difference in the charges = $45 - $30
= $15
John's Computer Repair charges more by $15.
Option (4) is the correct option.
