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S
 3 years ago
After an advertising campaign, the sales of a product often increase and then decrease. Suppose that t days after the end of the advertising the daily sales are,
f(t) =  6t^2 + 64t + 105 units.
a) What is the average rate of growth in sales during the fourth day that is from time t = 3 to t = 4.
b) In what instantaneous rate are the sales changing when t=3?
S
 3 years ago
After an advertising campaign, the sales of a product often increase and then decrease. Suppose that t days after the end of the advertising the daily sales are, f(t) =  6t^2 + 64t + 105 units. a) What is the average rate of growth in sales during the fourth day that is from time t = 3 to t = 4. b) In what instantaneous rate are the sales changing when t=3?

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S
 3 years ago
Best ResponseYou've already chosen the best response.0For a do you take a derivative and then plug in 3 and 4 and find the difference or what ?

Chlorophyll
 3 years ago
Best ResponseYou've already chosen the best response.1a) Avg = [ f (4)  f(3) ] / ( 4 3) = f (4)  f(3)

S
 3 years ago
Best ResponseYou've already chosen the best response.0MMmm ok.. so just a difference with no derivative. Ok thanks! What about b?

Chlorophyll
 3 years ago
Best ResponseYou've already chosen the best response.1b) instant rate = f' (3)

Chlorophyll
 3 years ago
Best ResponseYou've already chosen the best response.1Thanks for helping me to make it so simple ;)
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