Pls help pls

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

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined