To determine which of the options represent unit rates, we need to find out if they express a quantity per one unit of another quantity.
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$5 / 2 sandwiches: This is not a unit rate because it does not express a quantity per one sandwich.
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70 miles / 1 hour: This is a unit rate because it expresses a distance per one hour (70 miles per hour).
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80 words per minute: This is a unit rate because it expresses a quantity of words per one minute.
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18 ounces in 1 serving: This can be considered a unit rate as it conveys the quantity of ounces per one serving.
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$1.25 for 5 donuts: This is not a unit rate in the context of per one donut since it needs to be simplified to find the cost per one donut.
Thus, the options that represent unit rates are:
- 70 miles/ 1 hour
- 80 words per minute
- 18 ounces in 1 serving