Problem in the top right is S(t)=72/ 1+9e^-0.36t

1. After a new product is launched the cumulative sales S(t) (in $1000) t weeks after launch is given by S'(t) = 72 1+9e-0.361 a. Determine the cumulative amount in sales 3 weeks after launch. Round to the nearest thousand. b. Determine the amount of time required for cumulative sales to reach $70,000. c. What is the limiting value in sales