Posted by Natalie on .
Your Aunt will give your $1,ooo if you invest it for 10 years in an account that pays 20% interest compounded annually. That is, at the end end of each year your interest will be added to your account and invested at 20%.
What will your account be worth at the end of 10 years? How much interest will you earn during the 10t year?
(1+r)^n = where r is the interest stated as a decimal (in this case it would be 0.20) and n is the number of years, will give you the value of $1. Multiply that by the number of dollars to be invested. I hope this helps. Post your work if you have trouble.
3=642/
wats the answer for 3u(5u+7)=2
jennie, you should post this as a separate question, otherwise we'll miss it.
We have 3u(5u+7)=2
If you distribute the 3u over the other term we get
15u^221u = 2
Now bring the 2 to the left side
15u^221u+2=0
Now we need to find the roots of this equation. We can either try to factor the equation of we can use the quadratic formula. I think the Q.F is the way to go here.
we have x= 21/(2*15) +/sqrt(21^2  4(15)2))/(2*15)
Thus x=21/30 /+ sqrt(561)/30
or x = (21 +/sqrt(561))/30 if I did the arithmetic correctly.
I'll let you finish the arithmetic and verify the solution.

math 
unknown,
I don't get it