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Related rates |
2018-02-11 |
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angelo pose la question :
hi admin please help me answer this question. thank you!
At a certain instant of time, the angle A of a triangle ABC is 60 degrees and increasing at the rate of 5degrees per second, the side AB is 10cm and increasing at the rate of 1cm per second, and side AC is 16cm and decreasing at the rate of 1/2 cm per second. Find the rate of change of side AB?
Penny Nom lui répond. |
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Water in a cone |
2018-02-10 |
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Shuvo pose la question :
The diagram shows a vertical cross-section of a container in the form
of an inverted cone of height 60 cm and base radius 20 cm. The circular
base is held horizontal and uppermost. Water is pursed into the
container at a constant rate of 40 cm3/s.
Show that, when the depth of water in the container is x cm, the
volume of the water in the container is (πx^3)/27 cm3.
Find the rate of increase of "x" at the instant when "x" = 2.
Penny Nom lui répond. |
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3 yards 6 inches times 7 |
2018-02-08 |
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Tamara pose la question :
3 yards 6 inches × 7
Penny Nom lui répond. |
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A parallelogram, a rhombus and a rectangle |
2018-02-07 |
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Sambo pose la question :
what do parallelogram, rhombus and rectangle have in common?
Penny Nom lui répond. |
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The wholesale price given the retail price and the markup |
2018-02-07 |
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Matthew pose la question :
Retail $99
Mark-up is 80%
What is the equation to find the original (wholesale) price (55)?
thanks
Penny Nom lui répond. |
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Adding two negatives |
2018-02-04 |
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Pinasshakoane pose la question :
(-23)+(-3)
Penny Nom lui répond. |
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A question about perfect squares |
2018-02-04 |
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Jolyn pose la question :
Find the smallest possible value of a whole number m if 648x m is a perfect square
Penny Nom lui répond. |
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The code on a new phone |
2018-02-02 |
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Maria pose la question :
Hi -
My husband gave me a new Samsung Galaxy mobile for out anniversaire gift. He set me a challenge which I have to solve before I can use the Phone. He has set the pin code with numbers 4, 7 and 0 and created a four digit code with the said numbers. Is there a way I can somehow list all possible combinations and try them all? Thanks!
Penny Nom lui répond. |
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Similar rectangles |
2018-01-31 |
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Kathy pose la question :
A rectangular picture frame is 14 inches long and 4 inches wide. Which dimensions could a similar picture frame have.
8 L X 21 W
35 L X 15 W
49 L X 14 W
7 L X 3 W
Penny Nom lui répond. |
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Positive and negative values of a function |
2018-01-30 |
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Grayson pose la question :
f(x)=x^6-x^4
Interval: ( negative infinity, negative one )
Test Value: negative two
Function Value f(x): positive forty eight
Interval: ( negative one, zero )
Test Value: negative one
Function Value f(x): zero
Interval: ( zero, positive one )
Test Value: positive one
Function Value f(x): zero
Interval: ( positive one, positive infinity )
Test Value: positive two
Function Value f(x): positive forty eight
What is the sign of f(x) for each Interval?
Penny Nom lui répond. |
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Pricing a piece of plate steel |
2018-01-29 |
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Simo pose la question :
I have a piece of plate that is 2500mm x 8000mm x 20mm thick and costs $7693.00
what is the formula to work out what 1000mm x 1000mm is worth?
Penny Nom lui répond. |
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Simplify 1/2^i |
2018-01-28 |
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Deepak pose la question :
How do I simplify this complex equation:
z=1/(2^i)
Penny Nom lui répond. |
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The sum and difference of two numbers |
2018-01-25 |
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Ali pose la question :
Hello,
I was looking at the original question that was posted and answered by
your team:
http://mathcentral.uregina.ca/QQ/database/QQ.09.07/s/donna1.html
I used the 7 and 4 as example and not looking for 39 per original
question:
A=7
B=4
7+ 4 =11 and 7-4 = 3
We end up with 11 +3 = 14
A= 14/2 give use 7
B = how do you solve for B or 4 with out knowing anything about 3 or any other numbers ?
Thank you
Ali
Penny Nom lui répond. |
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The equation of a line |
2018-01-23 |
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Gloria pose la question :
Write the equation of a line in standard form through the point (1, 6) and perpendicular to the line 2x –y = 9.
Penny Nom lui répond. |
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y as an expression in terms of x |
2018-01-20 |
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Mark pose la question :
What is y as an expression in terms of x ?
pennt lui répond. |
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