A coin sold for $269 in 1980 and was sold again in 1989 for $ 477. Assume that the growth in the value V of the collector's item was exponential.

a) Find the value k of the exponential growth rate. Assume V equals269.

b) Find the exponential growth function in terms of t, where t is the number of years since 1980.

c) Estimate the value of the coin in 2013.

d) What is the doubling time for the value of the coin to the nearest tenth of a year?

e) Find the amount of time after which the value of the coin will be $2878.

black/brown

step-by-step explanation:

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5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10