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September 15, 2014

September 15, 2014

Posted by **Ak** on Tuesday, November 3, 2009 at 12:43am.

- Math, not "12" -
**Writeacher**, Tuesday, November 3, 2009 at 4:46amAssistance needed.

Please type your__subject__in the**School Subject**box. Any other words are likely to delay responses from a teacher who knows that subject well.

- 12 -
**Reiny**, Tuesday, November 3, 2009 at 7:50amLet the number of $2 increases be n

Now:

number of rooms = 210

cost per room = 45

cost of cleaning= 210(5)

After increase:

number of rooms = 210 - 3n

cost per room = 45 + 2n

cost of cleaning = 5(210-3n)

profits = (210-3n)(45+2n) - 5(210-3n)

= ...

expand the above, then express as a simplified quadratic.

If you know Calculus, differentiate and set equal to zero to solve for n

If you are doing these by completing the square, do so.

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