7balloons cost $ 9.1 what is the unit rate?

To find the unit rate, you just need to divide the total cost of the amount of items purchased by the amount of items purchased.

If 7 balloons costs $9.10, then you just need to divide 9.1 by 7 to get the unit price.

9.1 / 7 = 1.3

If 7 balloons costs $9.10, then one balloon costs $1.30.
The unit rate for the balloons is $1.30.
Hope that helped =)