If the ratio of rt/st = 5/7 what does rs equal

Can someone me with these two circle theorem questions asap?

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle