A computer technician charges $40 for a house call and $38 per hour. The expression 40 + 38t is used to find the cost of a house call that lasts t hours.
What is the cost of a house call that last 3 hours?
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6 + 3
To find the cost of a house call that lasts 3 hours using the expression 40 + 38t, we substitute 3 for t in the expression and then calculate the result.
So, we have:
Cost = 40 + 38t
Substituting t = 3:
Cost = 40 + 38 * 3
Now, we calculate the result:
Cost = 40 + 114
Cost = 154
Therefore, the cost of a house call that lasts 3 hours is $154.