Nathan's blog

So, this week all we did was review the stuff from chapter 5, which was basically an overview of our blue pie in aleks. This stuff was really easy, and this is the only thing the exam is on.

Section 5-2 was on rational exponents.
-The denominator tells you the root. The numerator is the exponent.
Ex. x^3/2= √x^3

In section 5-3, we learned a new formula.
-A(t)=Ao b^t/x
-Ao=starting amount
-b=Doubling, halfing, triplin, etc.
-t=time
-k=how long it takes to get b.

Ex. A bank advertises that if you open a savings account, you can double your money in 12 years. Find out how much money you will have after 7 years, if you invest $1,000.

Ao=1,000 b=2
t=7 k=12
A(t)=1,000(2)^7/12= $1498.31

Rule of 72

72/r%=how long it takes to double.

Ex. How long will it take to double your money at 12% interest?

72/12=6

Chapter 5 is pretty easy, and I should do good on the exam, because I understand most of it due to the fact that it is basically a review of what we've been doing.