Expoential Growth: One hundred dollars is invested in 90 day  TOPIC_SOLVED

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Expoential Growth: One hundred dollars is invested in 90 day

Postby orange1998 on Fri Mar 30, 2012 10:40 pm

One hundred dollars is invested in 90 days. At the end of the term, the investment is worth $120. Find the growth rate per day.

I do NOT get this...
My equation was; 120=100 times b^90. Using the formula y= a times b^x Is that equation right, and how do I solve it? Even if it's not right, just PLEASE help me solve it. Thanks! :confused:


Oh, and if/when you do solve this, EXPLAIN? Thanks, cause, I've got 5 more just like this one to solve. :)
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Re: Expoential Growth: One hundred dollars is invested in 90

Postby maggiemagnet on Sat Mar 31, 2012 10:46 am

orange1998 wrote:One hundred dollars is invested in 90 days. At the end of the term, the investment is worth $120. Find the growth rate per day.

I do NOT get this...
My equation was; 120=100 times b^90.

What is the value of b? Where is the "rate" in your equation?

orange1998 wrote:Oh, and if/when you do solve this, EXPLAIN?

There's an explanation of exponential growth here.
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Re: Expoential Growth: One hundred dollars is invested in 90

Postby orange1998 on Sat Mar 31, 2012 5:18 pm

Yeahh, the value of "b" is the rate change, that's what I'm having trouble figuring out. That's what we are looking for.. Thanks for the link. :)
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Re: Expoential Growth: One hundred dollars is invested in 90

Postby orange1998 on Sat Mar 31, 2012 5:40 pm

The thing is is that they're teaching me stuff with all those different equations, my teacher taught us y=a*b^x and says we should be able to use that to figure out this problem. :) I'm SUPER confused. Lol
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Re: Expoential Growth: One hundred dollars is invested in 90  TOPIC_SOLVED

Postby maggiemagnet on Mon Apr 02, 2012 12:43 am

Okay, if you're supposed to use that equation, then solve for the value of "b". Then interpret this value according to whatever formula they gave you.
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Re: Expoential Growth: One hundred dollars is invested in 90

Postby orange1998 on Thu Apr 05, 2012 2:52 am

Thanks, I figured it out. :)
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