Question 151698
Okay, we know adding the 3 sides of a triangle gives us the {{{Perimeter}}} right? 
Let's appoint "x" as measurement of the sides and based the conditions on this measurement.
1st side: She decided one side to be 6 feet shorter, = {{{x-6}}}
2nd side: She wants the other side 5 feet longer, = {{{x+5}}}
3rd side: {{{x}}}
Given {{{Perimeter=29ft}}}, therefor we can get the side by adding the three:
{{{29=(x-6)+(x+5)+x}}}
{{{29=3x-1}}} ---------> {{{29+1=3x}}}
{{{cross(30)10/cross(3)=cross(3)x/cross(3)}}}
{{{x=10ft}}} ------------> 3rd side
{{{10-6=4ft}}} --------------> 1st side
{{{10+5=15ft}}} --------------> 2nd side
Checking,
{{{29ft=10ft+4ft+15ft}}}
{{{29ft=29ft}}}
Thank you,
Jojo