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#29811

applications

equations

hard

90 sec

A tutoring service charges a one-time registration fee plus a constant hourly rate. A student who received 4 hours of tutoring was charged a total of $140. Another student who received 7 hours of tutoring was charged a total of $215. What is the one-time registration fee, in dollars?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.