Question

Please help me i need it bad

Answer 1

Using the secant-secant theorem,

`(13x+7-60)/(2)=5x-10 \\ \\ 13x-53=10x-20 \\ \\ 3x-53=-20 \\ \\ 3x=33 \\ \\ \boxed{x=11} \\ \\ \\ \\ \angle RDB=5(11)-10=\boxed{45^(\circ)}`