Question

In 1987, the Australian humpback whale population was 350 and has increased at a rate of about 14% each year since then. Write a function to model population growth. Use a graph to predict when the population will reach 20, 000.

Answer 1

Use the compound interest formula you used in the other question.

Answer 2

sooo wud it b
350(1+1.014)=20000

Answer 3

Almost, the graph you will draw is 350(1+0.014)^n. Then you will go to the point where the graph equals 20,000 and see how many years it has been.

Answer 4

290.9?

Answer 5

290.99 is the correct answer, did you solve it using the graph?

Answer 6

no im not sure how 2 graph it

Answer 7

http://www.wolframalpha.com/input/?i=350%281.014%29^n+from+-1+to+300

Answer 8

a)P(t) = 350(1.14)t; the population will reach 20,000 in about 30.9 yr.
b)P(t) = 350(0.86)t; the population will reach 20,000 in about 19.5 yr.
c)P(t) = 350(0.86)t; the population will reach 20,000 in about 39.1 yr.wwwwww
d)P(t) = 350(1.14)t; the population will reach 20,000 in about 25.6 yr.

Answer 9

Sorry, 290.99 is not the correct answer at all. The interest is 14% (which is 1.14), not 1.4% (which is 1.014). If you put 1.14 into the formula instead of 1.014 you should get the correct answer. Let me know how it goes.

Answer 10

wud it b A?

Answer 11

30.8?

Answer 12

The answer on my calculator is 30.87543347. The correct rounding of this to one decimal place is 30.9. So the answer is A.