Standard+2.5-ej

===Standard 2.5c: Model a situation that can be described by an exponential or logarithmic function, and use the model to answer questions about the situation.=== Model a situation is another way of saying word problems. Word problems can be confusing. The easiest way to work this kind of problems is to break down into smaller bits and solve each bit at a time.

Example Problem for Standard 2.5c Below are two example problems. They range from easy to difficult. The formula gives the annual interest rate,r, required for your money to double, what was thw approximate annual interest rate?....**
 * Problem 1-Easy**
 * r=2^(1/x)-1

To answer this question, you must understand what the equation is stating.

r=2^(1/x)-1


 * Problem 1 - Difficult**
 * Stacey delivers newspapers. She earns $15 each week plus $0.50 for each customer on her route. Write an equation she can use to find c, the number of customers she needs to earn exactly $25 each week?**

This question is only difficult because it is asking you to create an equation. It also is a word problem which is often harder for most students. In order to answer this question, think about what operations you have to use to get how much Stacy earns. This helps to create the equation. Well, Stacy makes 15 a week to start. But she also gets .50 for each customer. Well, to find out how much she gets if she had 10 customers, we would multiply .50 by 10 customers. We still would have to add 15 to get her amount. Let's see, we multiplied and added. Let's write an equation in words then replace the words with letters and numbers.

Stacy's weekly pay = .50 x customers + 15 $25 = .50c + 15

Podcast for Standard 1.1a
Below is a tutorial on understanding two-step equations and how to solve the problems.