 |
|
|
|
|
|
|
|
|
A sequence of transformations |
2005-01-03 |
|
From Abraham:
Please go to this web site and look at number 31.
http://www.nysedregents.org/testing/mathre/matharch/mathbtestau02.pdf
That is the New York state education web site.
Can you tell me if my answer would be marked correct? My answer was Transformation of 4,-3 (T 4,-3) followed by a reflection in the x-axis.If I graphed the question and wrote that, would I get full credit
Answered by Harley Weston. |
|
|
|
|
|
|
An elliptical table |
2005-01-03 |
|
From Roger:
Want to make an elliptical table, say the long (major) axis is 4 feet, and the short (minor) axis is 3 feet. I can construct this figure, but I'm trying to figure out what the exact dimension of a rectangle within this ellipse will be if I make the table a drop leaf type where the drop dimensions are equal for each end of both the long and short axes. Intuitively, it looks like there is one and only one solution.
Answered by Penny Nom. |
|
|
|
|
|
|
Standard deviation |
2005-01-02 |
|
From Urial:
Find the standard deviation of the given data set
To get the best deal for CD dealer, Jessica called eight appliance stores and asked the cast of a specific model. The prices she quoted are listed below.
$300, $203, $272, $332, $440, $119, $129,$254
Answered by Penny Nom. |
|
|
|
|
|
|
A 4-digit access code |
2005-01-02 |
|
From Missi:
I need to find the 4 digit number to access my voice mail. These numbers will be 0-9 & numbers can be repeated. Could you provide me with a list of possibly combinations? If not, do you know anywhere that I could get a list of combinations so I don't have to write it all down?
Answered by Harley Weston. |
|
|
|
|
|
|
A line from the center of the patch to the periphery |
2005-01-01 |
|
From Sandrine:
I am currently researching a patch disease of grasses. These patches are roughly circular. I need a term for a line from the center of the patch to the periphery. Since the patches are not perfectly circular, my supervisors tell me I cannot use the word 'radius'. What else could I use?
Answered by Denis Hanson and Harley Weston. |
|
|
|
|
|
|
A geometry problem |
2005-01-01 |
|
From Alexandra:
In triangle ABC, b=40, and angle A= 30 degres. What values of BC will give two solution for angle B?
Answered by Penny Nom. |
|
|
|
|
|
|
The golden ratio |
2004-12-31 |
|
From Cristina:
let x represent the longer segment. to find the golden ratio, write a proportion such that the longer of the two segments is the geometric mean between the shorter segment and the entire segment.Use the quadratic Formula to solve the proportion for X. Find the value in both radical and decimal form.
Answered by Penny Nom. |
|
|
|
|
|
|
The area of a triangle |
2004-12-30 |
|
From Perry:
What is the area of a triangle with dimensions 3"X5"X7"? Could you provide the formula?
Answered by Penny Nom. |
|
|
|
|
|
|
Gallons in a cylinder |
2004-12-29 |
|
From Dean:
I have 2 cylinders:
Cylinder A = 8'D x 12'H
Cylinder B = 10'D x 15'H
Each 1ft represents how many gallons of fluid?
Cylinder A=?
Cylinder B=?
Answered by Penny Nom. |
|
|
|
|
|
|
Cubic yards of dirt |
2004-12-28 |
|
From Stephen:
How many cubic feet or yards of dirt would be required to cover a 5 acre tract of land to a depth of 10 feet of compacted dirt?
Answered by Penny Nom. |
|
|
|
|
|
|
Six digit numbers with at least one 7 |
2004-12-27 |
|
From Behzad:
How many six-digit numbers contain at least one 7 in their decimal expansion?
Answered by Penny Nom. |
|
|
|
|
|
|
2^9833 days from today |
2004-12-26 |
|
From Pauline:
Today is Monday, 1 October 2001. What day of the week will be 29833 days from today?
Answered by Penny Nom. |
|
|
|
|
|
|
Half of five |
2004-12-26 |
|
From Pauline:
Why is four half of Five? Hint: It's the middle half?
Answered by Penny Nom. |
|
|
|
|
|
|
Modelling monthly temperature with a cosine |
2004-12-25 |
|
From Regis:
The average monthly temperature for a location in Ontario as a function of month number can be modelled using the equation y = a cos[k(t + b)] + d.
Answered by Harley Weston. |
|
|
|
|
|
|
An arithmetic progression |
2004-12-24 |
|
From A student:
the 4th and 5th term of an arithmetic progration 47 and 52 respactively find
a)d
b)a1
c)a50
Answered by Penny Nom. |
|
|
