Name: SAT Math Help & School Math Mastery
Availability: InStock

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#38648

applications

functions

medium

90 sec

An internet service provider charges a flat fee of $120 for the first three hours of installation and setup, plus an hourly rate for each additional hour. If the total cost for 7 hours of service is $270, which function $I$ gives the total cost in dollars, for $x$ hours of service, where $x \geq 3$ ?

A.

$I (x) = 37.5 x + 120$

B.

$I (x) = 37.5 x + 75$

C.

$I (x) = 37.5 x + 45$

D.

$I (x) = 37.5 x + 7.5$