What is an expression with a negative exponent that has a value between 0 and 1/2

Plot the intercepts to graph the equation

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.