Write standard form twenty one and four hundred six thousandths

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.