 |
|
|
|
|
|
|
|
|
The height of a hill |
2010-03-26 |
|
Amber pose la question :
A surveying team determines the height of a hill by placing a 12-foot pole at the top
of the hill and measuring the angles of elevation to the bottom and to the top of the pole.
They find the angels of elevation. Describe how to find the height of the hill.
Penny Nom lui répond. |
|
|
|
|
|
|
A radio tower |
2010-03-26 |
|
Alex pose la question :
The height of a radio tower is 450 feet, and the ground on one side of the tower slopes upward at an angle of 10 degrees. How long should a guy wire be if it is to connect to the top of the tower and be secured at a point on the sloped side 110 feet from the base of the tower?
Harley Weston lui répond. |
|
|
|
|
|
|
y = kx |
2010-03-26 |
|
harold pose la question :
if y =kx and y =4/15 and x=2/3, what is value of k
Penny Nom lui répond. |
|
|
|
|
|
|
Conditional probability |
2010-03-26 |
|
Sandy pose la question :
In a certain school, it is known that 80% of the students use the internet for school projects, 60% use e-mail on a regular basis, and 90% use the internet for school projects or for e-mail on a regular basis. A student from this school is selected at random
Determine the probability that the student used e-mail, given that the student used the internet for school projects.
Sandy
Penny Nom lui répond. |
|
|
|
|
|
|
A ladder against a wall |
2010-03-25 |
|
amber pose la question :
the distance from the bottom of the ladder to the building is18 foot less than the length of the ladder.How high up the building is the top of the ladder if that distance is 1 ft less than the length of the ladder?
Penny Nom lui répond. |
|
|
|
|
|
|
A negative times a negative |
2010-03-25 |
|
priya pose la question :
why is minus into minus plus?
Harley Weston lui répond. |
|
|
|
|
|
|
A proof by induction |
2010-03-25 |
|
SAMUEL pose la question :
use mathematical induction to proof that each statement is true for every positve integer n
1/1.2+1/2.3+1/3.4+......1/n(n+1)=n/n+1
Robert Dawson lui répond. |
|
|
|
|
|
|
A roll of paper |
2010-03-25 |
|
keith pose la question :
how many yds of paper for a roll with a width of 6.875 and a core of 3 in and a diameter of 40in?
Robert Dawson lui répond. |
|
|
|
|
|
|
The angle of intersection between two lines |
2010-03-25 |
|
Madhumitha pose la question :
How to find the angle of intersection between a line x=249 and another line which is of the form y=m*x+c; Line1 has a slope of infinity so what does the angle of intersection turn out to be? Or how can i find it?
Chris Fisher lui répond. |
|
|
|
|
|
|
The line passing through (2,6) and (2,9) |
2010-03-24 |
|
antoinette pose la question :
the equation of a line passing through the points (2,6) and (2,9)?
Penny Nom lui répond. |
|
|
|
|
|
|
GST and PST |
2010-03-24 |
|
z pose la question :
Hello math Central,
What is the math formula and method I can use, IN 1 STEP to extract ONLY both(pst/gst) & or gst TAXES from the total sale/purchase?
Harley Weston lui répond. |
|
|
|
|
|
|
A rectangle inscribed in a circle |
2010-03-24 |
|
sadiq pose la question :
here is the question,
in my mathematics book there is equation of the area of the rectangle
inscribed in a circle having equation x^2+y^2=a^2
and the area of rectangle is 4xy=4x(a^2-b^2)^1/2
i don't know what is b but a is surely the radius
(i want the derivation for the area of rectangle).
Harley Weston lui répond. |
|
|
|
|
|
|
How many 5 card hands in a deck of 52 have 2 aces and 3 other cards? |
2010-03-23 |
|
Travis pose la question :
How many 5 card hands in a deck of 52 have 2 aces and 3 other cards?
Penny Nom lui répond. |
|
|
|
|
|
|
The area of a hexagon |
2010-03-23 |
|
Myya pose la question :
What is the area of a hexagon with the radius of 10ft.
Penny Nom lui répond. |
|
|
|
|
|
|
How many 20"X20" tiles do I need to cover 90 sq. ft? |
2010-03-23 |
|
Karen pose la question :
How many 20"X20" tiles do I need to cover 90 sq. ft.
Penny Nom lui répond. |
|
|
