Ireally need the other 2 c and d are corresponding and vertical

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?

Which of the following is true for the relation f(x)=2x^2+1

What is the the greatest common factor ?