# Math Help - Exponential and logarithmic function help!

3. ## Re: Exponential and logarithmic function help!

Emakarov-

The salary option 2, is .03 in week 2, not 3. : < Sorry.. My mistake.

Well, I understand the multiplication aspect, but.. The functions are where I am having an issue. It's just setting up what the function looks like, I can solve it from there..

I'm sorry if this is confusing..
I'm aware this is probably a super easy problem to solve, but.. I always get marked down for little mistakes and I'm looking to make sure I get it right this time.

4. ## Re: Exponential and logarithmic function help!

The salary option 2, is .03 in week 2, not 3.
Then I have to repeat what I said replacing "week #3" with "weak #2":
Originally Posted by emakarov
Why does the table say that salary 2 for week #2 is .03? Shouldn't it be two times more than the previous week?
Well, I understand the multiplication aspect, but..
Then how much does the person earn in x weeks if he earns \$2000 per week?

The functions are where I am having an issue.
In this context, a function is just an arithmetic expression. After you figure out how much the person earns in x weeks under option 1, you'll get an expression that contains x. This expression determines a function: given any concrete x, the expression evaluates to a concrete number, the value of the function at x.

5. ## Re: Exponential and logarithmic function help!

I believe this is a geometric progression where the formula to find the total pennies for any given day is 2^n - 1 pennies, where n is the number of weeks. The equation for the first example is 2000x where x is the number of weeks.

6. ## Re: Exponential and logarithmic function help!

I figured that's what I was dealing with, I just have a hard time with trying to set up the equations.. Thanks Watt- I had 2(x-1) .. Which now I know makes no sense. Thank you for your help!