![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
A cone is 2/3 full of sand |
2014-12-14 |
![](/images/transparent.gif) |
Janice pose la question : A cone with a radius of 3.5 cm and a height of 12 cm is 2/3 full of sand.
What is the volume of the sand inside? Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
A right triangle |
2014-12-13 |
![](/images/transparent.gif) |
Katie pose la question : the shorter leg of a right triangle measures 2 feet less than the longer leg. the hypotenuse measure 10 feet. find all three sides Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Planar curves |
2014-12-13 |
![](/images/transparent.gif) |
ann pose la question : what does planar curve mean in your definition of a cone? Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
A cuboid |
2014-12-11 |
![](/images/transparent.gif) |
Nehal pose la question : Six cubes have a surface area of 24 cm2. They are joined together to male a cuboid.
What could the surface area of this cuboid be? There are two different answers. Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Remainder |
2014-12-08 |
![](/images/transparent.gif) |
Muqadasah pose la question : A number, when divided by136, leaves remainder 36. If the same number is divided by 17, what will be the remainder? Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
30% profit |
2014-12-05 |
![](/images/transparent.gif) |
Lyn pose la question : I would like to know a formula that I would use on a standard calculator to calculate a 30% profit margin on an item.
If I purchased an item at $7.70 how would I calculate 30% profit for me, not just 30% mark up? Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
A circle through 3 points |
2014-12-04 |
![](/images/transparent.gif) |
priyanka pose la question : Find the equation of a circle passing through the origin and intercept on axes are a and b. Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Shaking hands at a party |
2014-12-03 |
![](/images/transparent.gif) |
Nazrul pose la question : At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?
Please help me. Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
How do you change a decimal to a ratio? |
2014-11-29 |
![](/images/transparent.gif) |
Esmeralda pose la question : How do you change a decimal to a ratio? Express the decimal 0.2 as a ratio. Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
1999 equations in 1999 unknowns |
2014-11-28 |
![](/images/transparent.gif) |
Subrahmanya pose la question : Solve the following system of 1999 equations in 1999 unknowns :
x1+x2+x3=0, x2+x3+x4=0……., x1997+x1998+x1999=0,
x1998+x1999+x1=0, x1999+x1+x2=0.
(in x1,x2,...................,x1999 the numbers 1,2,.............,1999 are subscripts) Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Even and odd |
2014-11-28 |
![](/images/transparent.gif) |
Subrahmanya pose la question : n1, n2, n3....................,n1997 are integers not necessarily distinct. (actually in n1, n2,.............., n1997 the numbers 1,2,.................,1997 are subscripts of 'n')
X= (-1)^n1+(-1)^n2+............+(-1)^n998
Y=(-1)^n999+(-1)^n1000+............+(-1)^n1997
Then
which of the following options is true
A) (-1)^X = 1, (-1)^Y = 1 B) (-1)^X = 1, (-1)^Y = -1
C) (-1)^X = -1, (-1)^Y = 1 D) (-1)^X = -1, (-1)^Y = -1
E) none of these Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Exponential notation |
2014-11-27 |
![](/images/transparent.gif) |
Jaqui pose la question : May sound super easy, but how would you SHOW that you simplified
3x3 to the power of 2 (the little 2)?
thank you!
Jaqui Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
What is 20 and 3/5 of 10? |
2014-11-26 |
![](/images/transparent.gif) |
Jeannine pose la question : What is 20 and 3/5 of 10? Question is written exactly this way.
Is this 20 3/5 times 10 (103/5 times 10), or is it 20 and (3/5 times 10)? Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Mark's book case |
2014-11-24 |
![](/images/transparent.gif) |
anne pose la question : mark has 312 books in his case. he has 11 times as many fiction books as non fiction books. how many fiction books does mark have? Penny Nom lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
![](/images/transparent.gif) |
Cutting a hexagon with a sliding miter saw |
2014-11-23 |
![](/images/transparent.gif) |
Joseph pose la question : I need the angles in degrees for a hexagon one side is 18inches on the outside the problem I am having is in the angle of the cut and I am using a sliding miter saw which only goes from0 degrees to 45 degrees so I need help in getting the angle of the cut Harley Weston lui répond. |
![](/images/transparent.gif) |
![](/images/transparent.gif) |