The first three terms of a sequence are 4,8,16

a) Determine the value of r
b) Find the value of S₁₃ (must use and show formula)

Please include work on how to find r on a TI-84 calculator

Select the quadratic that has root x = 8 and x = -5

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?