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Recent problems solved by 'jringelman'

jringelman answered: 2 problems

Rectangles/207083: the lenght of a rectangle is three times the width. what is the width if the area is 147 square feet?
1 solutions

Answer 156673 by jringelman(2) on 2009-08-17 20:21:24 (Show Source):

You can put this solution on YOUR website!
start with 2 equations
l=3w
lw=147
use first equation to substitute "3w" for "l" in 2nd equation
(3w)w=147
3w^2=147
w^2=49
w=7 (this is the answer)
verify
l=3w=3*7=21
lw=7*21=147

Polynomials-and-rational-expressions/207206: This question is from textbook
The formula x^2-x=N can used to determine the total number of games played, N, in a league of X teams in which all teams play each other twice. Serena referees for a soccer league in which all teams play each other twice and a total of 90 games is played. How many teams are in the league?
1 solutions

Answer 156669 by jringelman(2) on 2009-08-17 20:09:25 (Show Source):

You can put this solution on YOUR website!
x^2-x=90
x(x-1)=90
x(x-1)=10*9
x(x-1)=10(10-1)
therefore, x=10 (there are 10 teams in the league)

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Recent problems solved by 'jringelman'