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Answer:
a) $900
b) 4 1/2 hours
Step-by-step explanation:
The price goes up by $200 for the additional hour between 2 and 3 hours of tutoring. If the relationship is linear, it will go up $200 again, from $700 to $900, as the time goes up from 3 hours to 4 hours.
The cost for 4 hours is $900.
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The session costing $1000 is only $100 more than a 4-hour session. Since the rate is $200 per hour, that $100 will pay for 1/2 hour more than 4.
A student can be tutored 4 1/2 hours for $1000.
