Answer the blank bits bc I can't get it ahwnqnsi

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?