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Quadratic equation a nearby resort rented a certain a no.of function rooms for P28 800. when the price was reduced by P20 per room,6 more rooms were rented. how many function rooms were rented?

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A boat takes 2 hours to row 24 km downstream and 3 hours to row the same distance upstream.Find the speeds of the boat in still water and of the current.

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If i am not mistaken you are saying the price was reduced by 20% per room hence here is the answers to your question.

Initially 24 rooms were rented at 28,800 for a total of 691200
AFTER THE 20% discount

You were already able to rent 30 rooms at 23040 for a total of 691200 hence you were able to rent 6 more rooms after the 20% discount

Posted on Oct 27, 2008

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The calculator cannot do symbolic algebra. If equation is aX^2+bX+c=0, write it in the form a(X^2+(b/a)X+(c/a))=0 and solve the quadratic equation X^2+(b/a)X+(c/a)=0. Get the approximate roots X1, and X2 (if they exist) and write your original equation in the for
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Y=aX^2+bX+c

The x-coordinate of the vertex is given by
X_v=-b/2a
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Quadratic equation fx-82ms


You can do it the same way people did it before calculators were invented. Just use the quadratic formula: http://en.wikipedia.org/wiki/Quadratic_formula, and let the calculator handle the arithmetic. Some sophisticated calculators have generalized equation solvers that can handle equations much more complicated than the quadratic, but the fx-82 isn't one of them.

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How can I compute quadratic equations using fx-300ES?


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1 Answer

A carpenter was contracted to repair a kitchen for $18000, the work took him 6 hours more than he has estimated and as a consequence, he earned $100 per hour less than he had estimated. how many hours had...


I will try to solve it systematically so it will be easier to understand. Note: The solution involves solving a quadratic equation.

Let amount of hours estimated be x:

Expected rate: $18000/(x hours)

Time spent extra: 6 hours.

Totals hours spent: (x + 6) hours

New rate: $18000/(x+6 hours)

Now:

18000/(x+6) x

The new rate is less than old rate by $100, therefore we can make the above inequality equality by adding $100 to the new rate.

18000/(x+6) + 100 = 18000/x

Solve by cross multiplaction:

(18000 + 100(x+6) * x = 18000 * (x+6)

18000x + 100x(x+6) = 18000x + 108000

Simplify:

100x(x+6) = 108000 (cancel 18000x on both sides)

x(x+6) = 1080 (divide by 100)

x^2 + 6x - 1080 = 0

Solve the above quadratic equation by any method (completing square, factorization or quadratic formula)

x = (-b+-(b^2 - 4ac)^.5)/2a where a = 1; b = 6; c = -1080

x = 30 or -36 (hours cannot be negative so disregard this result)

Therefore x = Estimated time = 30 hours

Check:

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Hello,
Doesn't any body do their homework anymore? How are they supposed to learn anything?
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Here is a graph. I even restricted it to the first quadrant so as not to mislead you into giving meaningless answers.


.e89465e.jpg

Hope it helps.

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This question is strangely worded and does not pertain to floppy drives. However, taking all information here as given and sufficient enough to form the equations, you arrive at the following:
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60(3.25) = 195 One tenant must pay $195 more for his extra 60square ft.
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