Answer:
$140
Step-by-step explanation:
When a variable is placed directly after the coefficient (the number) with no symbols between them, we are supposed to multiply the two together. The variable x represents the number of hours this person will spend cleaning your house, and we are trying to find the cost of 4 hours of cleaning. Therefore, we will substitute 4 for x:
[tex]f(x) = 35x \\ f(x) = 35(4)[/tex]
Then, we multiply 35 by 4:
[tex]f(x) = 35(4) \\ f(x) = 140[/tex]
