Both and contain a sum and a difference and have only 3 and in each factor.

If each expression is rewritten in standard form, will the two expressions be the same? Explain or show your reasoning.

1. Show that the expressions  and are equivalent.
2. The expressions  and are equivalent and can help us find the product of two numbers. Which two numbers are they?
3. Write  as a product of a sum and a difference, and then as a difference of two squares. What is the value of ?

Write each expression in factored form. If not possible, write “not possible.”

What are the solutions to the equation ?

Create a diagram to show that is equivalent to .

Select all the expressions that are equivalent to .

Mai fills a tall cup with hot cocoa, 12 centimeters in height. She waits 5 minutes for it to cool. Then, she starts drinking in sips, at an average rate of 2 centimeters of height every 2 minutes, until the cup is empty.

The function gives the height of hot cocoa in Mai’s cup, in centimeters, as a function of time, in minutes.

1. Sketch a possible graph of . Be sure to include a label and a scale for each axis.
2. What quantities do the domain and range represent in this situation?
3. Describe the domain and range of .

Two bacteria populations are measured at the same time. One bacteria population, , is modeled by the equation , where is the number of days since it was first measured. The second bacteria population, , is modeled by the equation .

Which statement is true about the two populations?