If JG=JF, GD=13, and mCD=136 degrees, find each measure

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

How many and of which kind of roots does the equation f(x)=x3−x2−x+1

The three sides of a triangle have lengths of 4x+3, 2x+8, and 3x-10. what is the length of the shortest side if the perimeter of the triangle is 136cm?