Posted by **mysterychicken** on Monday, June 14, 2010 at 5:20pm.

Need help with these 2 please--

19. Nancy invests $100 in one account for 10 years at a 9% interest rate compounded annually, and she invests $150 in an account for 10 years at a 6% interest rate compounded semi-annually. How much money will she have in the accounts after 10 years?

20. Suppose Tyler sprayed around the house for ants. Which formula would be used to find the number of ants still alive after a certain time if the number of ants was changing exponentially?

a. a = P(o.56)^t

b. y = mx + b

c. a = x

d. a = P(1.23)^t

Thanks

-MC

- Algebra -
**Reiny**, Monday, June 14, 2010 at 5:35pm
19

first investment = 100(1.09)^10 = ....

2nd investment = 150(1.03)^20 = ....

20.

I see 2 equations which look exponential

Of these two one has a base < 1, so things decrease

and the other has a base > 1, causing things to increase.

mmmmhhhh?

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