Question about Computers & Internet

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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.

Posted on Oct 29, 2009

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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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Posted on Jan 02, 2017

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

a(X-X1)(X-X2)=0

Your quadratic polynomial is factored as** a(X-X1)(X-X2)**

a(X-X1)(X-X2)=0

Your quadratic polynomial is factored as

May 28, 2014 | Casio Office Equipment & Supplies

Y=aX^2+bX+c

The x-coordinate of the vertex is given by

**X_v=-b/2a**

With a=-2, and X_v=8 you have**b=-2a*X_v**=-2(-2)*8=32

The equation can now be written as y=-2X^2+32X+c

To get** c** you substitute the value of X_v in the equation above and you set the result equal to Y_v=-4

-2(8)^2+32(8)+c=-4

Solve for c

c=-4+128-256=-132

**y=-2X^2+32X-132**

The x-coordinate of the vertex is given by

With a=-2, and X_v=8 you have

The equation can now be written as y=-2X^2+32X+c

To get

-2(8)^2+32(8)+c=-4

Solve for c

c=-4+128-256=-132

Nov 21, 2013 | Office Equipment & Supplies

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.

Nov 06, 2013 | Casio FX82MS Scientific Calculator

You cannot solve the quadratic equation with this calculator. It does not have a solve program.

However if you wnat to create a table of values for a function (any type of function that uses the basic scientific function keys ) you use the TABLE Computational Mode.

You press MODE

You select TABLE

You enter a mathematical expression 3X^2-.33X+ 15

You generate the table of values.

However if you wnat to create a table of values for a function (any type of function that uses the basic scientific function keys ) you use the TABLE Computational Mode.

You press MODE

You select TABLE

You enter a mathematical expression 3X^2-.33X+ 15

You generate the table of values.

Aug 28, 2011 | Casio fx-300ES Calculator

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:

18000/30 = $600 per hour x+6 = 36 $18000/36 = $500 or $100 per hour less than estimated

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:

18000/30 = $600 per hour x+6 = 36 $18000/36 = $500 or $100 per hour less than estimated

Nov 12, 2010 | Office Equipment & Supplies

Hello,

Doesn't any body do their homework anymore? How are they supposed to learn anything?

Draw your graphs by hand or on a graphing calculator.

Think about the intersection points. (What does that mean when two curves intersect?)

Use the equation for the demand to obtain D for a particular x.

You can also determine by how much one function exceeds another for a particular value of the x variable (the graph is rather clear).

I assume you can solve a quadratic equation.

Use these hints to solve the problem.

Here is a graph. I even restricted it to the first quadrant so as not to mislead you into giving meaningless answers.

.

Hope it helps.

Doesn't any body do their homework anymore? How are they supposed to learn anything?

Draw your graphs by hand or on a graphing calculator.

Think about the intersection points. (What does that mean when two curves intersect?)

Use the equation for the demand to obtain D for a particular x.

You can also determine by how much one function exceeds another for a particular value of the x variable (the graph is rather clear).

I assume you can solve a quadratic equation.

Use these hints to solve the problem.

Here is a graph. I even restricted it to the first quadrant so as not to mislead you into giving meaningless answers.

.

Hope it helps.

Oct 04, 2009 | Office Equipment & Supplies

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:

X=Y+60

60(3.25) = 195 One tenant must pay $195 more for his extra 60square ft.

(975-195)/2=390 The remaining rent (assuming the given info is all that is needed to solve)

390/3.25=120 is divided between the two and represents the rent of the smaller bedroom.

y=120 sq ft The rent of the smaller room holder is divided by $3.25 to reach the sq ft.

so,

x=180 sq ft

X=Y+60

60(3.25) = 195 One tenant must pay $195 more for his extra 60square ft.

(975-195)/2=390 The remaining rent (assuming the given info is all that is needed to solve)

390/3.25=120 is divided between the two and represents the rent of the smaller bedroom.

y=120 sq ft The rent of the smaller room holder is divided by $3.25 to reach the sq ft.

so,

x=180 sq ft

Sep 17, 2008 | Computers & Internet

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