Here are two patterns of dots.

1. How many dots will there be in Step 4 of each pattern?
2. Which pattern shows a quadratic relationship between the step number and the number of dots? Explain how you know.

Here are descriptions for how two dot patterns are growing.

• Pattern A: Step 2 has 10 dots. It grows by 3 dots at each additional step.
• Pattern B: The total number of dots can be expressed by , where is the step number.

For each pattern, draw a diagram of Step 0 to Step 3.

Each expression represents the total number of dots in a pattern, where represents the step number. 

Select all the expressions that represent a quadratic relationship between the step number and the total number of dots. (If you get stuck, consider sketching the first few steps of each pattern as described by the expression.)

The function, , gives the percentage of homes using only cell phone service  years after 2004. Explain the meaning of each statement.

3. How is different from ?

Here are some lengths, widths, and areas of a garden whose perimeter is 40 feet.  

A bacteria population is 10,000 when it is first measured and then doubles each day.

Graph the solutions to the inequality .