Quadrilateral abcd is inscribed in this circle. what is the measure of angle c?

1. what is the measure of ∠abc? what is the measure of ∠abd?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?