Hey can anyone help me solve this

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid