Help please don't understand

What are the vertical asymptotes of the function f(x) =5x+5/x2 + x-2

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Find the missing factor. write your answer inexponential form.9^2=9^4×