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andrew11 [14]
3 years ago
13

Newton currently has an account balance of $6225.18. He opened the account 15 years ago with a deposit of $4543.11. If the inter

est compounds daily, what is the interest rate on the account?
Mathematics
1 answer:
TiliK225 [7]3 years ago
4 0
Formula of the daily compound interest:
A = P.e^(r.t), where P is the initial investment, r = interest rate, t = number of years e= 2.718 and  A = final amount

6,225.18= 4,543.11(e)^(r.15)

(e)^(r.15) = 6,225.18/4,543.11

(e)^(r.15) = 1.3702046

ln[(e)^(r.15)] = ln(1.3702046)

15.r = 0.314991

And r = 0.314491/15 = 0.020 OR  2%
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3 years ago
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statuscvo [17]

Answer:

-1/8

Step-by-step explanation:

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Reciprocal:

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I really need help. please help
Anna [14]
I'm pretty sure the answer to A would be this: the common point that satisfies both equations (where they intersect) can be shown AS 4^(-x) = 8^(-x-1). 

The answer to B is forming a table. This is quite easier than you think :D.

Start with x on one side (3) and go all the way down to -3 like this:

(x)    4^-x    8^-x-1
-3      64       (Do the same with this)
-2      16
-1       4
0        1
1       1/4
2     .0625 
3   .015625  

So basically you just fill in the x variable with every number between 3 and -3. After that, it's just a bit of math and you've done it!

C is a bit misguided. I think it would be quite simple to just use a graphing calculator, but you would have to actually input all the x and y values from the table. After that, you will have a graph.

I hope I helped! Good luck and good day!

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