Which is a unit rate?
4 dollars
3 cans
5 students
2 teachers
6 hours : 1 book
3 miles : 2 days

the last 2 are a unit rate

Step-by-step explanation: A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity.

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square