Saturday

August 30, 2014

August 30, 2014

Posted by **Anonymous** on Tuesday, December 13, 2011 at 9:43pm.

A)How far from the ends of the board should the string be attached?

B)How long should the string be?

- College Algebra -
**drwls**, Wednesday, December 14, 2011 at 1:52amThe semimajor axis is a = 2 ft.

The semiminor axis is b = 1.5 ft.

The equation of the ellipse is

x^2/a^2 + y^2/b^2 = 1

I have assumed (0,0) is the center of the rectangle.

The foci are at y = 0 and x = +/- c, where

c = sqrt[a^2 - b^2] = sqrt1.75

= 1.323 ft

The distance of the foci from the closest end of the board is 4 - 1.323 = 2.677 ft

String length = 2c = 2*s

- analytic geometry -
**drwls**, Wednesday, December 14, 2011 at 1:55amIgnore the final '=2s '

The answer got sent before I could finish.

2c = 2.646 ft is the string length

- College Algebra -
**Anonymous**, Wednesday, December 14, 2011 at 11:52amthe sum of one half a number, one third a number and one twelfth of a number is 33. find the original number

**Related Questions**

Math Word Problem - A carpenter is cutting a 3ft by 4ft elliptical sign from a ...

math help - please explain your answer and how you got it.. Samantha had a ...

math m, - A sheet of cardboard 3ft by 4ft will be made into a box by cutting ...

Geometry - What is the area semi-circle piece of glass for Norman glass when the...

Math - find the surface area and volume of a similar figure that is larger by ...

math - convert 48in= ft A)3ft B)4ft C)5ft D)6ft

8th grade math - What is the volume of a crate with the dimensions of 4ft by 3ft...

Math - Find the perimeter of a triangle with sides 2ft 4in, 3ft, and 4ft 6in.

Math - 2) which set of measure could be the side lengths of a right triangle? A...

not for school - Hi I'm writing a story and I had a question. I am saying that ...