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Area = 1/2 ab SinC |
2007-12-03 |
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From Eileen:
Given: Acute triangle ABC, with a, b, c, being the respective opposite sides to angle A, angle B, angle C, and altitude, h, drawn from angle B to b.
Prove: The area of trianlge ABC=1/2abSin C
Answered by Stephen La Rocque. |
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Sharing a cake |
2007-12-03 |
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From Nikheel:
Amar baked a cake.
john ate 1/6 of the cake.
susan ate 1/5 of what was left.
chan ate 1/4 of what was left.
cindy ate 1/3 of what was left.
luigi ate 1/2 of what was left.
how much of the original cake was left.
Answered by Stephen La Rocque. |
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Ball bearings in an oil can |
2007-12-03 |
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From Lisa:
One hundred ball bearings with radius 5 mm are dropped into a cylindrical can, which is half full of oil.
The height of the cylinder is 20 cm and the radius is 8 cm.
By how much does the level of the oil rise?
Answered by Stephen La Rocque. |
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Une sphere |
2007-12-03 |
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From karine:
voici ce que je dois trouver ; j'aiune boule disco mesurant 48'' de diametre
je veux savoir combien de petit miroir il y a sur cette boule si les petits miroires
on 1'' carré ?
Answered by Claude Tardif. |
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n(n+1) est un nombre pair |
2007-12-02 |
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From Christel:
Bonjour. J'aimerai savoir comment l'on peut démontrer que n(n+1) est un nombre pair. Si vous avez une méthode...Merci d'avance
Answered by Claude Tardif. |
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Delivering microwave ovens |
2007-12-02 |
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From Barbara:
Fernando and Kevin are delivering microwave ovens to a local appliance store, whose freight elevator can hold no more than 900 pounds. If Fernando weighs 180 pounds, Kevin weighs 240 pounds, and the microwave ovens weigh 30 pounds each, how many microwaves can Fernando and Kevin deliver at one time if they must ride in the elevator as well?
Answered by Stephen La Rocque. |
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If x=18, prove that sin2x=cos3x. |
2007-12-02 |
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From amy:
If x=18, prove that sin2x=cos3x.
find the exact values of sinx and cosx
Answered by Penny Nom. |
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Repeating decimals |
2007-12-02 |
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From Jack:
I've been working on an equation to support my theory of repeating decimals. Specifically the correlation between the 9 and 11 denominators. I wanted to know if there was already an equation to describe this correlation? Mine is x/11=.b repeating and b=9x, so if you use any single digit number for x (say 4) if 9 x 4 = 36 then 4/11 = .36363636... I just want to know if this theory already exists and if so, what is it called?
Answered by Victoria West. |
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6 nickels, 4 dimes, and 2 quarters |
2007-12-02 |
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From manny:
Suppose you have 6 nickels, 4 dimes, and 2 quarters in your pocket. If you draw a coin randomly from your pocket, what is the probability that
a. You will draw a dime?
Answered by Penny Nom. |
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Converting grams of hair spray into milliliters |
2007-12-02 |
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From komal:
I am confused that i am converting 75grams of hair spray ( liquid) into ML? but i couldnt get the answer what is perfect answer for that please help me for this thing.
Answered by Penny Nom. |
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The area of an octagon inscribed in a circle |
2007-12-01 |
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From Harry:
I need to find the area of an octagon in a circle. each point of the octagon touches the edge of the circle, and the circle's diameter = 4 cm. What is the area of the octagon
Answered by Penny Nom. |
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Blood type probabilities |
2007-12-01 |
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From Noelle:
Question from Noelle, a student:
Blood Type % Population
O+ 37.4%
O- 6.6%
A+ 35.8%
A- 6.3%
B+ 8.5%
B- 1.5%
AB+ 3.4%
AB- .6%
I need to make another table showing the probablility of meeting someone in each of the eight blood groups. I'm not sure how to find the probability with percentages. Thanks for your help.
Answered by Penny Nom. |
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What would be the cost of a 10 in * 15 in canvas? |
2007-12-01 |
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From Jasmine:
a 40in *60 in canvas is sold for $60.00 if the price is determined by the cost of the material what would be the cost of a 10 in * 15 in canvas
Answered by Stephen La Rocque. |
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What angle should he turn? |
2007-12-01 |
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From Jasmine:
Bob is traveling due north he then turns left 45 degrees followed by four 20 degree turns to the right
What is his new heading if he needed to turn so his heading was SSW what direction and what angle should he turn?
Answered by Walter Whiteley. |
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The diameter of a gasket |
2007-12-01 |
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From Jorge:
I have an application where I am using a circular silicone gasket. I have the total length but would like to calculate the diameter with the given length. What formula should be used? We receive these gaskets in a roll and cut them about 21 inches and glue the ends together to make it one piece. I would prefer to purchase these already cut and glued but require a diameter. If I had the overall diameter from a 21 inch length gasket, I can look on-line for a part that comes close to the diameter.
Jorge
Answered by Harley Weston. |
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