We entered a new part of calculus and I'm lost on how to answer these type of questions.

a) The cost of rst-class postage stamp was 4;: in 1961 and 44 in 2010. This increase represents exponential growth. Write the function 8 for the cost of a stamp tyears after 1961 (t: 0). b) What was the growth rate in the cost? c) Predict the cost of a rstaclass postage stamp in 2017, 2020, and 2023. d) The Forever Stamp is always valid as rstclass postage on standard envelopes weighing 1 ounce or less, regardless of any subsequent increases in the rst-class rate. An advertising rm spent $4400 on 10,000 rst-class postage stamps in 2009. Knowing it will need 10,000 rst-class stamps in each of the years 2010-2024, it decides at the beginning of 2010 to try to save money by spending $4400 on 10,000 Forever Stamps, but also buying enough of the stamps to cover the years 2011 through 2024. Assuming there is a postage increase in each of the years 2017, 2020, and 2023 to the cost predicted in part (0), how much money will the rm save by buying the stamps? a) Choose the correct answer below. 0 A- 3m = 4 e kt O 3- sm=o.05.e41 O 6- 3(t)=490-"5t O 9- 3(t)=o.05.e4'1t