 |
|
|
|
|
|
|
|
|
A trig problem |
2007-09-16 |
|
From Tracy:
I have a scalene triangle ABC, angle C is 20 degrees, side AC is 8cm and side AB is 3 cm.
Line CB is extended to point D which is perpendicular to point A, triangle ABD is a right-angled triangle.
How do I calculate length of line AD
Answered by Stephen La Rocque. |
|
|
|
|
|
|
An equation with fractions |
2007-09-16 |
|
From Stuart:
4/5+3x/8=x/4-1/10
Answered by Victoria West. |
|
|
|
|
|
|
Finding the center of a circle that goes through three given points |
2007-09-16 |
|
From Gary:
I am given three points represented by their Latitude and Longitude. How do I determine the Latitude and Longitude of the center of a circle through the three given points?
The lat/lon of the three points are:
A. N 43 degrees 30.251 min. W 96 degrees 45.695 min.
B. N 43 degrees 30.006 min. W 96 degrees 45.082 min.
C. N 43 degrees 30.719 min. W 96 degrees 45.410 min.
Thanks.
Answered by Stephen La Rocque. |
|
|
|
|
|
|
How far from n do you need to go to have found at least one prime? |
2007-09-16 |
|
From Mike:
Hi,
I was wondering if there was some kind of guaranteed interval that ensures that if you start at some number n, you will always have passed a prime number p.
I remember having once read something that there is always at least one prime between n and 2n, but I cannot for the life of me remember where I read that, or what that kind of rule would be called so I can look it up online...
thank you for your help,
Mike
Answered by Penny Nom and Victoria West. |
|
|
|
|
|
|
how do you simplify 3a + 13b = 37 |
2007-09-16 |
|
From brandon:
how do you simplify 3a + 13b = 37
Answered by Penny Nom. |
|
|
|
|
|
|
Tens and ones |
2007-09-16 |
|
From julia:
My son has come home with a math question "what i know about 10s and 1s" we're totally stumped any information you can provide would be greatly appreciated
Answered by Harley Weston. |
|
|
|
|
|
|
Volume of a cylinder |
2007-09-15 |
|
From mike:
I need to know the formula to measure conceret celinders
Answered by Penny Nom. |
|
|
|
|
|
|
Number sentences |
2007-09-15 |
|
From jen:
list the addition number sentences that can be written using two sets of cards with the numbers 5 6 and 7. which number sentences have the same addends but show a different order?,,,,,,,,,,,,,,Ithis is for my son in 3rd grade and for the life of us we can't figure it out,,thanks for this elementary help
Answered by Harley Weston. |
|
|
|
|
|
|
Intercepts |
2007-09-15 |
|
From Bruce:
The equation is x^2-12.
I need to find the x-y intercepts and horizontal intervals (increasing & decreasing)
I would have thought the y intercept would be (0,-12) however the book came up with something different.
Answered by Penny Nom. |
|
|
|
|
|
|
Volume, mass and density |
2007-09-14 |
|
From Nathan:
I have a sample of material that is 10cmx10cmx5cm and has a mass of 29 grams. How many grams would a sample of the same material that was 96cmx188cmx5cm be?
Answered by Penny Nom. |
|
|
|
|
|
|
How much stone will be needed to fill the trench? |
2007-09-14 |
|
From Debbie:
A trench 100metres long 1ft wide*18inches deep with a 4inch pipe laid. How much stone will be needed to fill the trench.
How much weight in stone would I need to fill it?
Answered by Penny Nom and Victoria West. |
|
|
|
|
|
|
Differentiate x^(1/3) using first principles |
2007-09-14 |
|
From Sheila:
our teacher gave us this question as a challenge and even he couldnt figure it out:
Differentiate x^(1/3) [aka the cube root of x] using first principles. i know the answer is 1/(3.x^2/3), but how is it possible using first principles?
Answered by Harley Weston. |
|
|
|
|
|
|
Three digit numbers where all digits are even |
2007-09-14 |
|
From Cielo:
Hannah made a list of all of the three digit whole numbers where all three digit were even. How many three digit whole numbers were on Hannah's list?
Answered by Penny Nom. |
|
|
|
|
|
|
Is it platinum or silver? |
2007-09-14 |
|
From Jordan:
In Chemistry we are doing a lot of problems that are much more math related than anything. One of my questions reads: A certain medallion has a mass of 55.64 g. When placed in 75.2 mL of water in a graduated cylinder,
the water level rises and then reads 77.8 mL.
Is the medallion made of platinum (D=21.4 g/mL) or silver (D= 10.5 g/mL)?
Answered by Penny Nom. |
|
|
|
|
|
|
Two equations in two unknowns |
2007-09-14 |
|
From CAMEILA:
NEED T0 SOLVE THIS EQUATION
Y = -2X + 6
Y + 6 = 2x
Answered by Stephen La Rocque. |
|
|
