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une écriture plus simple des expressions |
2011-01-13 |
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jessie pose la question :
trouver une écriture plus simple des expressions suivantes sachant que : x + y = 3 et x - y =-2
A=x-1+y+2 B=x-1+y-2
C=x+1+y+2 C=x+1+y-2
Claude Tardif lui répond. |
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The height of a lamp |
2011-01-13 |
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Dorothy pose la question :
I need to find the lamp height with casting shadow (base line of triangle where a boy 1.6m tall stands 3m from base of street lamp and has a 2m shadow. In other words, think of a right angle triangle with zero height starting at left, then 2m to right stands boy (1.6m high). Angle (hypotenuse) increases up to top of street lamp with 'x' height and 3m base.
Penny Nom lui répond. |
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What is next in the sequence? |
2011-01-13 |
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jodi pose la question :
what is next in the sequence 1, 1/4, 1/9, 1/16, 1/25
Penny Nom lui répond. |
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The angle between a line and a plane |
2011-01-12 |
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tom pose la question :
what are the angles of the diagonal of a rectangular parallelepiped 2in by 3 in by 4 in
makes with the faces...
You know this is a problem that I can't figure out ...I don't know where
the angle and the diagonals where? can you help me with this one?
Penny Nom lui répond. |
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Is this a permutation or a combination? |
2011-01-11 |
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Lamont pose la question :
If I have 10 marbles: 3 blue, 2 yellow, 1 purple, and 4 red
How many ways can I pull out 3 different sets of marbles?
Is this a permutation or a combination?
Penny Nom lui répond. |
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The weight of a tank |
2011-01-11 |
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tom pose la question :
A tank, open at the top is made up of thin sheet iron 1in. thick. The internal
dimensions of the tank are 4 ft. 8in. in long ;3 ft. 6 in.in wide ;4ft 4 in. in deep
Find the weight of the tank when empty, and find the weight when full of salt
water. (Salt water weighs 64 lbs. per cu. ft., and iron is 7.2 times as heavy as
salt water)
Harley Weston lui répond. |
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Identify each polynomial by its degree and number of terms |
2011-01-10 |
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betty pose la question :
Write in standard form and identify each polynomial by its degree and number of terms. How do you do this?
Penny Nom lui répond. |
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Set notation |
2011-01-10 |
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Ron pose la question :
The question asked in a handout:
8k - 5 < 35, keI
I believe the answer to k is 5. But what does the k e(E) I mean in this?
Harley Weston lui répond. |
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Semicircles and the Pythagorean Theorem |
2011-01-09 |
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Jas pose la question :
Okay well, in math we are learning about the pythagorean theorem and we have to do a math journal on the question:
****Can you replace the squares (that are put on the sides of a right triangle) with semicircles and still get the same answer??
I do not understand because i tried doing an example and comparing it with a normal way of doing it and I didnt get the same answer!
Penny Nom lui répond. |
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Tiling a swimming pool |
2011-01-09 |
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rustom pose la question :
(a) Find the volume of water in swimming pool with vertical ends and sides
. The length measured at the water line is 50 ft. and the breadth is 20 ft. The
bottom of the swimming pool is a plane sloping gradually downward so that
the depth of the water at one end is 4 ft. and 8ft. at the other end.
(b) If the sides, ends, and bottom of the swimming pool are constructed of
tile blocks whose glaze surface dimensions are 3in by 6in. , and if the ends
and sides of the pool extend 2ft.above the water level, find the number of
blocks used if 1/20 of the surface area is covered by sealing material.
I got the (a) question but I don't know the (b) question which have the answer
of 16,136 blocks. I hope I can get the procedure for this, THANK YOU!
Penny Nom lui répond. |
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Tan(x+pi)-tan(pi-x)=2tan(x). |
2011-01-09 |
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Steven pose la question :
Verify the identity:
Tan(x+pi)-tan(pi-x)=2tan(x)
Penny Nom lui répond. |
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10 golfer playing 5 rounds |
2011-01-09 |
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Jeff pose la question :
need pairing for 10 golfer playing 5 rounds of golf.
Victoria West lui répond. |
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A 400 gallon oil tank |
2011-01-08 |
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theresa pose la question :
we have a oil tank that holds 400 gallons of oil currently there is 11/16 volume in the tank how many gallons are there?
Harley Weston lui répond. |
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A sector of a circle |
2011-01-07 |
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Alice pose la question :
the radius of a circle is 7cm the angle of the sector is 68 how do you find the
Penny Nom lui répond. |
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What is its speed in miles per hour? |
2011-01-06 |
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Miriam pose la question :
An airliner travels 125miles in 15minutes. What is its speed in miles per hour?
Penny Nom lui répond. |
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