(2x-y+2)^2 using suitable identites

Could someone with number 1 and 2

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

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