I need A and B please!

A company estimates that its sales will grow continuously at a rate given by the function S'(t) =26 et where S'(t) is the rate at which sales are increasing, in dollars per day, on day t. a) Find the accumulated sales for the first 9 days. b) Find the sales from the 2nd day through the 5th day. (This is the integral from 1 to 5.) a) The accumulated sales for the first 9 days is $ (Round to the nearest cent as needed.)