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The height of a hill |
2010-03-26 |
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From Amber:
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.
Answered by Penny Nom. |
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A radio tower |
2010-03-26 |
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From Alex:
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?
Answered by Harley Weston. |
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y = kx |
2010-03-26 |
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From harold:
if y =kx and y =4/15 and x=2/3, what is value of k
Answered by Penny Nom. |
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Conditional probability |
2010-03-26 |
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From Sandy:
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
Answered by Penny Nom. |
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A ladder against a wall |
2010-03-25 |
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From amber:
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?
Answered by Penny Nom. |
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A negative times a negative |
2010-03-25 |
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From priya:
why is minus into minus plus?
Answered by Harley Weston. |
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A proof by induction |
2010-03-25 |
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From SAMUEL:
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
Answered by Robert Dawson. |
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A roll of paper |
2010-03-25 |
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From keith:
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?
Answered by Robert Dawson. |
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The angle of intersection between two lines |
2010-03-25 |
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From Madhumitha:
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?
Answered by Chris Fisher. |
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The line passing through (2,6) and (2,9) |
2010-03-24 |
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From antoinette:
the equation of a line passing through the points (2,6) and (2,9)?
Answered by Penny Nom. |
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GST and PST |
2010-03-24 |
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From z:
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?
Answered by Harley Weston. |
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A rectangle inscribed in a circle |
2010-03-24 |
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From sadiq:
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).
Answered by Harley Weston. |
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How many 5 card hands in a deck of 52 have 2 aces and 3 other cards? |
2010-03-23 |
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From Travis:
How many 5 card hands in a deck of 52 have 2 aces and 3 other cards?
Answered by Penny Nom. |
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The area of a hexagon |
2010-03-23 |
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From Myya:
What is the area of a hexagon with the radius of 10ft.
Answered by Penny Nom. |
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How many 20"X20" tiles do I need to cover 90 sq. ft? |
2010-03-23 |
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From Karen:
How many 20"X20" tiles do I need to cover 90 sq. ft.
Answered by Penny Nom. |
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