9.) An inferior product with an extensive advertising campaign does well when it is released, but sales decline as people discontinue use of the product. If the sales S (in thousands of dollars) after t weeks are given by

What is the rate of change of sales when t=7?

9. DETAILS PREVIOUS ANSWERS HARMATHAP12 9.7.043. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An inferior product with an extensive advertising campaign does well when it is released, but sales decline as people discontinue use of the product. If the sales S (in thousands of dollars) after t weeks are given by 210t S(t) = (t + 5 ) 2 ' t20 what is the rate of change of sales when t = 7? (Round your answer to two decimal places. ) S'(t) = 0 X Interpret your result. From the 7th to the 8th week, sales will increase approximately |S'(t) | thousand dollars. From the 7th to the 8th week, sales will increase approximately |S'(t) | dollars. From the 7th to the 8th week, sales will decrease approximately [S'(t) | dollars. o From the 7th to the 8th week, sales will decrease approximately |S'(t) | thousand dollars. Need Help? Read It