Answer the question in the picture

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?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

Write the percent as a fraction or mixed number in simplest form. 0.8%