# Tutor profile: Alina S.

## Questions

### Subject: SAT

Aaron is staying at a hotel that charges $99.95 per night plus tax for a room. A tax of 8% is applied to the room rate, and an additional onetime untaxed fee of $5.00 is charged by the hotel. Which of the following represents Aaron’s total charge, in dollars, for staying x nights?

1.08(99.95x)+5 The total charge that Aaron will pay is the room rate, the 8% tax on the room rate, and a fixed fee. If Aaron stayed x nights, then the total charge is (99.95 x plus 0.08 * 99.95 x) + 5, which can be rewritten as 1.08 (99.95 x) + 5.

### Subject: Java Programming

What's the difference between String and StringBuilder class in Java?

String is an immutable class meaning you would have to account for additional memory every time you want to change or make an edit to a String. In StringBuilder you can modify strings efficiently

### Subject: Calculus

What is the limit as x approaches infinity of $$ \frac {1}{x^2-3x+5} $$ *$$ \sqrt{9x^4 + 1} $$

3

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