







Equal ordinate and abscissa 
20130815 

From sonit: the slope of tangent to the curve y=(4x^2)^1/2 at the point, where the ordinate and abscissa are equal, is Answered by Penny Nom. 





Numbers or Percentage or probability or what? 
20090107 

From Chew: Teacher A teaches 50 students and 45 of them obtained straight As.
Teacher B teaches 5 students and 5 of them obtained straight As.
Which teacher would you send you child to and why? Answered by Robert Dawson and Harley Weston. 





Filling a cistern with two pipes 
20080514 

From ramya: two pipes P and Q would fil a cistern in 30 mins and 40 mins respectively.
both pipes being opened. find when the first pipe be turned off so that the cistern may be just filled in 20 mins.
options:
1. after 10 mins
2. after 15 mins
3. after 20 mins
4. after 25 mins Answered by Stephen La Rocque. 





1(1P)^75=0.05 
20080405 

From Amy: 1(1P)^75=0.05 Answered by Stephen La Rocque and Penny Nom. 





Imprecise measurements 
20071209 

From Sara: Hi!
A water tank, in the shape of a cuboid (length 1.6 m, height 1.2 m, breadth 0.8 m), is full of water.
Water is drained from the tank at a rate of 8 litres per minute. The dimensions of the tank are given to the nearest 10 cm.
The rate at which the water is drained from the tank is given to the nearest 0.5 litres per minute.
(a) Calculate the smallest possible time to drain the tank.
(b) Calculate the greatest possible time to drain the tank.
Many thanks!!! Answered by Stephen La Rocque. 





A decision based on data 
20071204 

From manny: You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items. The higher the manual dexterity of a worker the less likelihood that worker will break significant inventory. Because of a unique contract you must hire all 10 employees from one of the two groups and none of the employees from the other.
You must decide which group to choose. Choose at least two measures of central tendency and at least one measure of dispersion for each group and use those to make your choice. Be sure to justify your choice with at least one page of discussion and analysis. Answered by Penny Nom. 





32 cis30degrees / 4 cis150degrees 
20070921 

From Michael: Could you please help with this one.
32 cis30degrees / 4 cis150degrees Answered by Stephen La Rocque. 





The volume of a cistern 
20070719 

From sharon: We have a cistern to hold spring water that measures 12 feet in depth by 5 feet in diameter. How much in liquid gallons will it hold? Answered by Penny Nom. 





Terminology 
20030831 

From Maria: My daughter Veronica is a rising 6th grader and has to complete some Summer Math assignments and would like to ask you three questions:  ___________ are number pairs that have a product of 1.
 You can name any point on a plane with two numbers. These two numbers are called _____________.
 A _______________ is the size of a cube that is exactly 1 inch on each edge.
Thanks, Answered by Penny Nom. 





Yaxis 
19970529 

From Leah: I know that the proper name for the X axis is the abscissa, but, what is the proper name for the Y axis? Answered by Chris Fisher. 





Des exercices complémentaires 
20060226 

From Nathalie: Bonjour, mon fils est en 2e année dans une école de Montréal. Il éprouve des difficultés en mathématiques. Auriezvous des sites à me suggérer dans lesquels je pourrait trouver des exercices complémentaires à lui faire faire. Answered by Claude Tardif. 

