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une écriture plus simple des expressions |
2011-01-13 |
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From jessie:
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
Answered by Claude Tardif. |
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The height of a lamp |
2011-01-13 |
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From Dorothy:
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.
Answered by Penny Nom. |
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What is next in the sequence? |
2011-01-13 |
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From jodi:
what is next in the sequence 1, 1/4, 1/9, 1/16, 1/25
Answered by Penny Nom. |
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The angle between a line and a plane |
2011-01-12 |
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From tom:
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?
Answered by Penny Nom. |
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Is this a permutation or a combination? |
2011-01-11 |
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From Lamont:
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?
Answered by Penny Nom. |
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The weight of a tank |
2011-01-11 |
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From tom:
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)
Answered by Harley Weston. |
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Identify each polynomial by its degree and number of terms |
2011-01-10 |
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From betty:
Write in standard form and identify each polynomial by its degree and number of terms. How do you do this?
Answered by Penny Nom. |
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Set notation |
2011-01-10 |
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From Ron:
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?
Answered by Harley Weston. |
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Semicircles and the Pythagorean Theorem |
2011-01-09 |
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From Jas:
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!
Answered by Penny Nom. |
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Tiling a swimming pool |
2011-01-09 |
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From rustom:
(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!
Answered by Penny Nom. |
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Tan(x+pi)-tan(pi-x)=2tan(x). |
2011-01-09 |
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From Steven:
Verify the identity:
Tan(x+pi)-tan(pi-x)=2tan(x)
Answered by Penny Nom. |
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10 golfer playing 5 rounds |
2011-01-09 |
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From Jeff:
need pairing for 10 golfer playing 5 rounds of golf.
Answered by Victoria West. |
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A 400 gallon oil tank |
2011-01-08 |
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From theresa:
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?
Answered by Harley Weston. |
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A sector of a circle |
2011-01-07 |
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From Alice:
the radius of a circle is 7cm the angle of the sector is 68 how do you find the
Answered by Penny Nom. |
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What is its speed in miles per hour? |
2011-01-06 |
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From Miriam:
An airliner travels 125miles in 15minutes. What is its speed in miles per hour?
Answered by Penny Nom. |
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