Question

In 1990, the population of the U.S. was approximately 250 million and was expected to grow according to the function P(x) = 250,000,000e^ (0.009x),
where x is the number of years after 1990. What will the expected U.S. population be in 2010, according to this model?

Answer 1

Hint: x = 20

Answer 2

lol i already knew x was 20 :P

Answer 3

Okay, well, plug it in:

P(20) = 250,000,000e^ (0.009(20))

You're gonna need a calculator

Answer 4

okay im stuck...i keep getting like 2 million n something..

Answer 5

Hmm, I get something different. Make sure you put the right amount of zeroes. Try again.

Answer 6

i got 45,000,000. ?

Answer 7

I hate to say this, but you're using your calculator wrong. You should get a number very close to 300 million.

Answer 8

hmmm >.<

Answer 9

im not using the calculator wrong. >.<

Answer 10

You must be inputting some value incorrectly. You and I both know that the population has to increase.

Answer 11

okay the equation is P(20) = 250,000,000e^ (0.009(20))

I multiply 0.009 by 20 right?

Answer 12

Yes and you should try inputting that all at once into the calculator.

Answer 13

can you walk me thru this equation. >.< because i still seem to be entering sumthing wrong or something.

Answer 14

Enter:

250,000,000

times

e

power

(0.009*20)

Hit =

Answer 15

Make sure your calculator is in radians, and not degrees. Sometimes, that affects things.

Answer 16

well that's why... >.< i don't a scientific calculator that does that stuff....

Answer 17

I can't imagine what kind of calculator you have that gives wrong answers. You should probably trash it and find a better one.